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Your FREE CPC Flashcards 2026 – 200+ Cards

Realistic, CPC exam-style flashcards on CPT, modifiers, E/M, ICD-10-CM and HCPCS — flip, match, type, and quiz yourself.

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Click Study Flashcards above to open the flashcard hub — hundreds of CPC cards you can flip, match, type, or quiz yourself on. Every card is drawn from AAPC’s content areas of physician/outpatient coding, so you study exactly what the exam tests.[1] Pair them with our free practice test and study guide.

CPC Flashcard Study Modes

Flip mode lets you work through each card front and back at your own pace. Match turns term-to-definition recall into a timed game. Type shows the definition and asks you to produce the term, so a card like Modifier 25 has to come from memory. Quiz builds multiple-choice questions from the same cards for a quick check under pressure.

Free CPC flashcards from Career Employer — active recall for the AAPC Certified Professional Coder exam

Why Flashcards Work for the CPC

Coding Guidelines, Modifiers & Compliance is the biggest block at 62 cards, and it covers the rules layer sitting over every code you assign. You get compliance terms like Upcoding and Unbundling, payer policy distinctions such as LCD vs NCD, and a run of modifier fronts including Modifier 25, Modifier 26 and Modifier 24. Credentialing context shows up too, on the card that contrasts CPC vs CCS and the one on OIG (HHS).

CPT Surgery by Body System holds 44 cards and organizes the surgical section the way the manual does. Fronts like 10000 series CPT, 30000 series CPT and 50000 series CPT anchor the ranges, while a procedure-level card such as Tympanostomy tests whether you can place a specific service in the right family. The CPT code set card frames the numbering system the rest of the domain depends on.

ICD-10-CM & HCPCS Level II brings 38 cards on diagnosis and supply coding: ICD-10-CM itself, convention pairs like NOS vs NEC, and situational concepts such as Underdosing and Z codes, alongside letter-series fronts including HCPCS A codes and HCPCS E codes. Medical Terminology & Anatomy adds 32 cards of word parts and structures, with Suffix ’-ectomy’, Prefix ’dys-’ and Body cavities among the fronts that make an unfamiliar procedure description readable.

Anesthesia, Radiology, Path/Lab & Medicine covers 29 cards across the specialty sections, from Anesthesia formula and Modifier 26 vs TC to Modifier 91 (lab) and Radiology subsections. Evaluation & Management closes the deck with 27 cards on visit-level coding, including Three elements of MDM, Risk in MDM and Modifier 57 (E/M), plus setting-specific fronts like Nursing facility E/M and ED E/M codes.

The CPC is dense with terminology — CPT modifiers and symbols, E/M leveling rules, ICD-10-CM conventions, and HCPCS codes.[3] Spaced flashcards are the most efficient way to keep it all fresh. Used alongside our practice test and study guide, they turn review time into measurable progress.

CPC Flashcards by Topic

The cards are organized by AAPC’s content blocks. Drill the highest-yield ones first — the CPT surgery sections and the modifiers that decide answers across the exam:[1]

CPC flashcards by topic
TopicWhat it covers
CPT Surgery by Body System10000–60000 series: lesion excision, repairs, packages, add-on codes
Evaluation & ManagementNew vs established, leveling by MDM or time (2021+)
Anesthesia, Radiology, Path/Lab & MedicineTime units, 26/TC components, lab panels, immunizations
Medical Terminology & AnatomyPrefixes, suffixes, combining forms, body systems
ICD-10-CM & HCPCS Level IIConventions, 7th character, J codes, modifiers
Coding Guidelines, Modifiers & ComplianceModifiers, NCCI edits, fraud vs abuse, ABN

How to Get the Most Out of These Flashcards

  • Start with the rules. Coding Guidelines, Modifiers & Compliance carries 62 cards, more than any other domain, and its modifier and compliance vocabulary resurfaces inside surgery, E/M and specialty questions alike.
  • Type the look-alikes. Fronts such as Unbundling and LCD vs NCD reward exact recall, so typing the term from its definition exposes the pairs you only half know.
  • Match the word parts. The Medical Terminology & Anatomy prefix and suffix cards, Suffix ’-pexy’ and Prefix ’a-/an-’ among them, are short enough that timed matching builds real speed.
  • Switch when Quiz stops surprising you. Once multiple choice on modifiers and code ranges feels routine, move to the practice test, where cases make you apply guidelines instead of recognizing terms.
  • Keep the cadence small. With 232 cards, work one domain per session, recycle missed cards into the next Flip pass, and revisit Evaluation & Management often since its 27 cards compound.

CPC Flashcards FAQ

Hundreds of free CPC flashcards, organized across the AAPC content areas — CPT surgery coding, Evaluation & Management, anesthesia/radiology/path-lab/medicine, medical terminology & anatomy, ICD-10-CM, HCPCS Level II, and coding guidelines/modifiers/compliance. They're free with no account required.

CPC flashcard bank

All 232 cards, by topic

A reference copy of every card in this deck. Each answer stays hidden until you choose to show it. To study with Flip, Match, Type and Quiz modes and track what you have mastered, use Study Flashcards at the top of the page.

CPT Surgery by Body System (44)

CPT code set
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The AMA's Current Procedural Terminology — codes that report physician and outpatient procedures and services; the core code set for the CPC exam.

CPT surgery sections (by series)
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10000 Integumentary, 20000 Musculoskeletal, 30000 Respiratory/Cardiovascular/Hemic-Lymphatic, 40000 Digestive, 50000 Urinary/Genital/Maternity, 60000 Endocrine/Nervous/Eye/Auditory.

10000 series CPT
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The Integumentary System — skin, subcutaneous tissue, and accessory structures (lesion excision, repairs, skin grafts, breast procedures).

How is a benign skin lesion excision coded?
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By the EXCISED DIAMETER = greatest clinical diameter of the lesion + the narrowest margins required, then by anatomic site and benign vs malignant.

Excised diameter formula
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Excised diameter = lesion diameter plus two times the narrowest margin. Code each lesion separately; choose benign (11400–11471) or malignant (11600–11646) by anatomic site.

Wound repair classification
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Simple (superficial, one-layer), Intermediate (layered closure), Complex (more than layered — debridement, extensive undermining). Coded by site and total length.

Multiple wound repairs — same classification
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Add together the lengths of repairs in the same classification and anatomic group and report a single code for that combined length.

20000 series CPT
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The Musculoskeletal System — fractures, dislocations, casting/strapping, arthroscopy, spine, joints, and grafts.

Fracture care: open vs closed treatment
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Refers to the TREATMENT method, not the fracture type. Closed = no surgical opening; open = surgical exposure of the fracture; percutaneous = fixation through the skin.

30000 series CPT
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Respiratory, Cardiovascular, Hemic & Lymphatic, and Mediastinum & Diaphragm systems.

Cardiac catheterization coding
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Combination codes bundle the catheter placement, imaging supervision, and injection; selective vs non-selective catheter placement determines the code.

40000 series CPT
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The Digestive System — mouth to anus plus the liver, biliary tract, and pancreas (endoscopy, hernia repair, cholecystectomy).

Endoscopy 'extent' rule
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Code the endoscopy to the FURTHEST extent reached. If a surgical endoscopy is performed, it includes the diagnostic endoscopy of the same procedure.

Hernia repair coding factors
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Code by hernia type (inguinal, ventral, umbilical), whether it is initial vs recurrent, reducible vs incarcerated/strangulated, and patient age (for inguinal).

50000 series CPT
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Urinary, Genital (male and female), and Maternity Care & Delivery systems.

Global obstetric (maternity) package
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Antepartum care + delivery + postpartum care reported with one global code (e.g., 59400 vaginal). Report components separately only when the same provider doesn't furnish all care.

60000 series CPT
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Endocrine, Nervous, Eye & Ocular Adnexa, and Auditory systems.

Global surgical package
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A surgical CPT code includes the operation plus related pre-op evaluation, local anesthesia, and routine post-op care during the global period — not billed separately.

What is a separate procedure (CPT)?
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A code designated '(separate procedure)' is bundled when done with a more comprehensive related procedure; report it alone only when it is the only/independent service.

Bilateral procedure reporting
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Append modifier 50 to the CPT code for a procedure performed on both sides of the body in the same session (one line, increased payment), unless the code is inherently bilateral.

Skin graft coding factors
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Coded by graft type (autograft, allograft, xenograft, skin substitute), recipient site, and size in square centimeters (sq cm).

Debridement coding
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Reported by depth (skin, subcutaneous, muscle/fascia, bone) and total surface area; deeper level codes are chosen when deeper tissue is removed.

Arthroscopy vs arthrotomy
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Arthroscopy = joint surgery through a scope; arthrotomy = open surgical incision into a joint. A surgical arthroscopy includes the diagnostic arthroscopy.

Maternity: when to use 59025
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59025 = fetal non-stress test, reported separately from the global OB package.

Mohs micrographic surgery
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A single physician acts as both surgeon and pathologist, removing skin cancer in stages; coded by stage and number of tissue blocks (17311–17315).

Destruction of lesions (CPT)
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Codes 17000–17286 report destruction (e.g., laser, cryosurgery, electrosurgery) of benign, premalignant, or malignant lesions, often by lesion count.

Breast biopsy vs mastectomy
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Biopsy removes a sample for diagnosis; mastectomy (partial, simple, modified radical, radical) removes breast tissue therapeutically — coded by extent.

Application of casts and strapping
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Reported separately only when the cast/strap is NOT part of the global fracture-care code (e.g., a replacement cast or when no restorative treatment is done).

Spinal procedure components
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Vertebral approach, arthrodesis (fusion), instrumentation, and bone graft may each be reported; many graft/instrumentation codes are add-on (+) codes.

Bronchoscopy coding
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Reported by approach and the most extensive procedure performed (diagnostic vs with biopsy, brushing, or therapeutic intervention); the surgical bronchoscopy includes the diagnostic.

Coronary artery bypass graft (CABG)
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Coded by the NUMBER and TYPE of grafts: venous (33510–33516), arterial (33533–33536), and combined arterial-venous (add-on 33517–33523 with arterial codes).

Pacemaker vs defibrillator coding
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Coded by single vs dual vs biventricular lead system and whether it is an initial insertion, replacement, or revision of the generator and/or leads.

Laparoscopic vs open approach
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CPT distinguishes laparoscopic from open procedures; if a laparoscopy converts to an open procedure, report only the open code.

Cholecystectomy coding
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Laparoscopic cholecystectomy 47562–47564 (with or without cholangiography/exploration); open 47600–47620. Code the approach actually completed.

Cystourethroscopy
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Endoscopic exam of the bladder and urethra (52000 series); the code reflects the most extensive procedure performed (biopsy, stone removal, fulguration).

Maternity delivery-only codes
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Used when one provider does the delivery but not all global care (e.g., 59409 vaginal delivery only); separate antepartum/postpartum codes apply for split care.

Cesarean section coding
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59510 = routine global C-section (antepartum + cesarean delivery + postpartum); 59514 = cesarean delivery only.

Craniectomy vs craniotomy
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Craniotomy = bone flap removed and replaced; craniectomy = bone removed and not replaced. Coded in the 61000–62258 nervous-system range.

Cataract extraction coding
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Coded by technique — extracapsular, phacoemulsification, or with intraocular lens (IOL) insertion (66982–66984); complex cataract codes require documentation.

Tympanostomy
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Insertion of ventilating tubes (69433/69436) in the auditory section; general anesthesia vs local affects code selection.

Endocrine surgery (thyroid)
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Thyroidectomy coded by extent — partial/total lobectomy, total/subtotal, with or without limited neck dissection (60210–60271).

Operative report components
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Header (patient, date, surgeon), preoperative and postoperative diagnoses, procedure(s) performed, and the body describing what was done — the coder's source for CPT selection.

Greatest clinical diameter
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For lesion excision, measured BEFORE removal (the lesion plus margins), not the pathology specimen size after fixation/shrinkage.

Surgical vs diagnostic endoscopy
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When a lesion is treated during a scope, report the surgical endoscopy code; it includes the diagnostic endoscopy of the same site.

Evaluation & Management (27)

Evaluation and Management (E/M)
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CPT codes (99202–99499) reporting non-procedural physician visits — office, hospital, ED, consults, critical care — the signature CPC topic.

2021+ office/outpatient E/M leveling
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Codes 99202–99215 are leveled by Medical Decision Making (MDM) OR total time on the date of the encounter. History and exam no longer determine the level.

Three elements of MDM
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(1) Number and complexity of problems addressed, (2) amount/complexity of data reviewed, (3) risk of complications/morbidity. The level needs 2 of the 3 met or exceeded.

New vs established patient (E/M)
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New = not seen by the provider (or same-specialty group) in the prior 3 years; established = seen within 3 years. New-patient visits require/allow higher work.

MDM complexity levels
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Straightforward, Low, Moderate, High — these map to the office/outpatient E/M levels (e.g., 99213 = low, 99214 = moderate, 99215 = high).

E/M time (2021+ office)
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Total time = all time the physician/QHP personally spends on the date of the encounter (face-to-face AND non-face-to-face), not just counseling time.

Critical care time coding
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99291 = first 30–74 minutes of critical care; +99292 = each additional 30 minutes. Time-based and includes bundled services (e.g., interpretation of certain data).

Key components (legacy E/M categories)
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History, Examination, and Medical Decision Making — still used to level E/M categories other than 2021+ office/outpatient (e.g., some hospital/consult rules vary by year).

Consultation requirements
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A request from another provider for opinion/advice, the rendering of that opinion, and a written report back to the requesting provider (the classic 'three R's').

Modifier 57 (E/M)
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'Decision for surgery' — appended to the E/M visit at which the decision to perform a MAJOR (90-day global) surgery was made.

Prolonged services (office)
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+99417 reports each additional 15 minutes beyond the highest-level office E/M (99205/99215), used when leveling by total time.

ED E/M codes
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99281–99285 report emergency department visits; ED codes have no new vs established distinction (all ED patients are treated the same way).

Preventive medicine vs problem E/M
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Preventive (99381–99397) is age-based wellness; if a significant problem is also addressed, report a problem E/M with modifier 25 in addition.

Subsequent hospital care
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99231–99233 report follow-up inpatient visits; leveled (low/moderate/high) by MDM or time per the current E/M rules.

Initial hospital inpatient/observation
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99221–99223 report the first encounter of the admitting provider; observation and inpatient initial-care codes were merged in the CPT update.

Office consult codes status
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99241–99245 (office consults) and inpatient consults 99251–99255 exist in CPT, but Medicare does not pay consultation codes — report the appropriate E/M visit instead.

Discharge day management
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99238 (30 minutes or less) and 99239 (more than 30 minutes) report hospital discharge services; time-based on the total discharge-day work.

Nursing facility E/M
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99304–99318 report nursing-facility initial and subsequent care visits.

Home/residence E/M
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99341–99350 report E/M services in a patient's home or residence (new and established).

Chronic care management (CCM)
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99490 and related codes report non-face-to-face care coordination for patients with multiple chronic conditions, by clinical staff time per month.

Transitional care management (TCM)
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99495/99496 report care after discharge to a community setting, including a timely interactive contact and a face-to-face visit within a set window.

Newborn care codes
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99460–99463 report initial and subsequent normal newborn care; separate codes apply to attendance at delivery and resuscitation.

Counseling/coordination dominance (legacy)
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When counseling/coordination dominates a non-2021-office visit (>50% of time), total time may drive the E/M level — document the time and content.

Risk in MDM
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The risk element considers diagnostic/treatment options, including prescription drug management, decisions about surgery, and social determinants affecting management.

Problems addressed in MDM
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Counts the number and complexity of problems managed at the encounter — self-limited, stable chronic, undiagnosed new problem, acute with systemic symptoms, etc.

Concurrent care
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Similar services provided to the same patient by more than one provider on the same day; each reports their own E/M, with documentation distinguishing the work.

Time-based vs component-based E/M
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Office/outpatient (2021+) use MDM or total time; other categories may still use the three key components or counseling-dominated time rules.

Anesthesia, Radiology, Path/Lab & Medicine (29)

Anesthesia time reporting
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Begins when the anesthesiologist prepares the patient and ends when the patient is safely placed under post-anesthesia care; reported in time units plus base units.

Anesthesia formula
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Payment = (base units + time units + modifying units) times a conversion factor. Each CPT anesthesia code carries assigned base units for the procedure's complexity.

Physical status modifiers (anesthesia)
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P1 (normal healthy) through P6 (brain-dead organ donor) — describe the patient's condition; P3–P5 may add complexity units.

Qualifying circumstances (anesthesia)
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Add-on codes 99100–99140 for situations that complicate anesthesia (extreme age, hypothermia, emergency); reported in addition to the anesthesia code.

Radiology component coding
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Professional component (modifier 26) = the physician's interpretation; technical component (modifier TC) = the equipment/technician; global = both together.

Modifier 26 vs TC
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26 = professional component (interpretation and report only); TC = technical component (equipment, supplies, technician). No modifier = global (both).

Contrast 'with contrast' rule
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'With contrast' in radiology means contrast administered intravascularly, intra-articularly, or intrathecally — oral/rectal contrast alone is coded 'without contrast.'

Radiologic supervision and interpretation (S&I)
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Codes that report the imaging guidance and interpretation portion of a procedure, often paired with the surgical/injection CPT code.

Pathology & Laboratory panels
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Organ/disease panels (e.g., 80053 comprehensive metabolic) bundle specific tests; all listed tests must be performed to report the panel code.

Modifier 91 (lab)
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Repeat clinical diagnostic laboratory test — appended when the same test is repeated on the same day to obtain subsequent results (not for confirming an initial result).

Surgical pathology levels
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88300–88309 are leveled (I–VI) by the specimen's complexity and the work of examination; each specimen is reported separately.

Medicine section (90000 series)
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Reports non-surgical services: immunizations, injections, dialysis, cardiovascular (ECG, stress test), pulmonary, ophthalmology, psychiatry, and physical medicine.

Vaccine coding: two codes
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Report the vaccine/toxoid product code AND the administration code (e.g., 90471 first immunization administration) — both are required.

Therapeutic vs diagnostic injection
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96372 = therapeutic/prophylactic/diagnostic subcutaneous or intramuscular injection; report the drug supplied separately with a HCPCS J code.

Monitored anesthesia care (MAC)
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Anesthesia modifiers QS (MAC service), G8, and G9 describe MAC; the same base/time-unit methodology applies.

Anesthesia provider modifiers
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AA (anesthesiologist personally), QK (medical direction of 2–4 concurrent), QX (CRNA with direction), QZ (CRNA without medical direction).

Moderate (conscious) sedation
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Reported with 99151–99157 by patient age and time; some procedures include sedation inherently and it is not separately reported.

Radiology subsections
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Diagnostic radiology, diagnostic ultrasound, radiologic guidance, mammography, bone/joint studies, radiation oncology, and nuclear medicine.

Radiation oncology coding
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A treatment course is coded across phases: consultation, clinical treatment planning, simulation, dosimetry, treatment delivery, and management.

Nuclear medicine coding
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Includes the imaging study; the radiopharmaceutical (diagnostic or therapeutic) is reported separately, often with a HCPCS code.

Drug testing (presumptive vs definitive)
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Presumptive (80305–80307) screens for a drug class; definitive (80320 series) identifies specific drugs/metabolites — code per the methodology and number of analytes.

Molecular pathology tiers
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Tier 1 codes report specific gene analyses; Tier 2 codes group analyses by level of complexity when no Tier 1 code exists.

Clinical lab vs anatomic pathology
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Clinical lab = chemistry, hematology, microbiology on specimens; anatomic pathology = surgical pathology and cytopathology of tissue/cells.

Cardiovascular medicine codes
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ECG (93000 components), echocardiography, cardiac stress testing, and catheter-based diagnostics live in the Medicine section (93000 series).

Dialysis coding
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End-stage renal disease (ESRD) services are reported per month by patient age and number of visits (90951–90970).

Physical medicine & rehab
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97000-series codes report PT/OT modalities and therapeutic procedures; many are timed (per 15 minutes) under the 8-minute rule.

Ophthalmology E/M alternative
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92002–92014 (eye exam codes) may be reported instead of E/M for eye visits, by new/established and intermediate/comprehensive.

Psychiatry codes
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Psychotherapy 90832–90838 are time-based; add-on codes report psychotherapy provided with an E/M service.

Allergy coding
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Allergy testing (95004 series, by number of tests) is separate from allergen immunotherapy (95115–95170).

Medical Terminology & Anatomy (32)

Prefix 'hyper-' vs 'hypo-'
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hyper- = excessive/above normal; hypo- = deficient/below normal (e.g., hyperglycemia vs hypoglycemia).

Suffix '-ectomy'
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Surgical removal/excision (e.g., appendectomy = removal of the appendix).

Suffix '-otomy' vs '-ostomy'
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-otomy = a surgical incision into; -ostomy = creation of an artificial opening (stoma). Colotomy = incision; colostomy = opening.

Suffix '-plasty'
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Surgical repair or reconstruction (e.g., rhinoplasty = repair of the nose).

Suffix '-itis'
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Inflammation (e.g., appendicitis, gastritis).

Prefix 'a-/an-'
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Without or absence of (e.g., apnea = without breathing).

Combining form 'cardi/o'
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Heart (e.g., cardiomyopathy = disease of the heart muscle).

Combining form 'nephr/o' vs 'ren/o'
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Both mean kidney; nephr/o is Greek-derived (nephrectomy) and ren/o is Latin-derived (renal).

Anatomical position planes
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Sagittal (left/right), coronal/frontal (front/back), transverse/axial (upper/lower). Used to describe imaging and surgical orientation.

Directional terms
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Proximal (nearer the trunk) vs distal (farther); anterior/ventral (front) vs posterior/dorsal (back); medial (toward midline) vs lateral (away).

Body cavities
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Dorsal (cranial + spinal) and ventral (thoracic + abdominopelvic). The diaphragm divides the thoracic and abdominopelvic cavities.

Abdominal quadrants
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RUQ, LUQ, RLQ, LLQ — used to localize symptoms and surgical sites (e.g., appendicitis pain classically in the RLQ).

Integumentary system layers
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Epidermis (outer), dermis (middle, with vessels/nerves), subcutaneous/hypodermis (fat). Lesion-excision depth affects CPT selection.

Major body systems (coding-relevant)
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Integumentary, musculoskeletal, respiratory, cardiovascular, digestive, urinary, reproductive, endocrine, nervous, and special senses — mirror the CPT surgery sections.

Suffix '-pexy'
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Surgical fixation or suspension (e.g., nephropexy = fixation of the kidney).

Suffix '-rrhaphy'
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Surgical suturing/repair (e.g., herniorrhaphy = suture repair of a hernia).

Suffix '-scopy' vs '-graphy'
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-scopy = visual examination with a scope; -graphy = the process of recording an image (e.g., angiography).

Suffix '-centesis'
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Surgical puncture to remove fluid (e.g., thoracentesis, amniocentesis).

Suffix '-lysis'
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Breakdown, destruction, or freeing from adhesions (e.g., adhesiolysis).

Prefix 'brady-' vs 'tachy-'
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brady- = slow (bradycardia); tachy- = fast (tachycardia).

Prefix 'dys-'
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Painful, difficult, or abnormal (e.g., dysphagia = difficulty swallowing).

Combining form 'hepat/o'
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Liver (e.g., hepatomegaly = enlargement of the liver).

Combining form 'oste/o'
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Bone (e.g., osteoarthritis, osteotomy).

Combining form 'cyt/o' vs 'hist/o'
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cyt/o = cell; hist/o = tissue (cytology vs histology).

Combining form 'enter/o' vs 'gastr/o'
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enter/o = small intestine; gastr/o = stomach (gastroenteritis = inflammation of stomach and intestine).

Combining form 'pneum/o' vs 'pulmon/o'
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Both relate to lung/air; pneum/o (pneumonia, pneumothorax) and pulmon/o (pulmonary).

Cardiovascular anatomy: chambers
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Two atria (upper, receiving) and two ventricles (lower, pumping); the right side handles deoxygenated blood, the left side oxygenated.

Respiratory tract order
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Nose/pharynx → larynx → trachea → bronchi → bronchioles → alveoli (site of gas exchange).

Digestive tract order
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Mouth → esophagus → stomach → small intestine (duodenum, jejunum, ileum) → large intestine (colon) → rectum → anus.

Urinary system order
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Kidneys → ureters → bladder → urethra; the nephron is the functional filtering unit of the kidney.

Skeletal divisions
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Axial skeleton (skull, vertebral column, rib cage) and appendicular skeleton (limbs and girdles).

Muscle types
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Skeletal (voluntary, striated), cardiac (involuntary, striated, in the heart), and smooth (involuntary, in organs/vessels).

ICD-10-CM & HCPCS Level II (38)

ICD-10-CM
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The U.S. diagnosis code set used in all settings to report the reason for the encounter; 3–7 alphanumeric characters with a required decimal after the third character.

ICD-10-CM 7th character (injuries)
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A = initial encounter (active treatment), D = subsequent encounter (healing/recovery), S = sequela (late effect). Placeholder X fills empty positions before the 7th.

ICD-10-CM placeholder X
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A dummy 'X' that fills an empty character position so a required 7th character lands in the correct slot (e.g., T36.0X1A).

Excludes1 vs Excludes2
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Excludes1 = NOT coded here — the two conditions cannot occur together. Excludes2 = 'not included here' — both conditions MAY be coded together if documented.

'Code first' note
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Instructs the coder to sequence the underlying/etiology condition before the manifestation code (e.g., code the underlying disease first, then the manifestation).

'Use additional code' note
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Tells the coder to add a secondary code to fully describe the condition (e.g., add a code for the infectious organism or causal agent).

Coding signs & symptoms
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Do NOT code signs/symptoms that are integral to a confirmed definitive diagnosis; code them when no definitive diagnosis is established or when they are not routinely associated.

Outpatient 'probable/suspected' rule
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In the OUTPATIENT setting, never code 'probable,' 'suspected,' 'rule out,' or 'questionable' diagnoses — code to the highest degree of certainty (the signs/symptoms).

Combination code (ICD-10-CM)
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A single code that classifies two diagnoses, or a diagnosis with an associated manifestation or complication (e.g., type 2 diabetes with diabetic neuropathy).

Z codes
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ICD-10-CM codes for factors influencing health status and encounters for reasons other than disease (screenings, aftercare, exposure, status).

Laterality in ICD-10-CM
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Many codes specify right, left, or bilateral. If the side isn't documented and laterality is required, an unspecified-side code may be needed or the provider queried.

Underdosing
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ICD-10-CM coding for taking LESS of a medication than prescribed; coded with a T36–T50 code with the 5th/6th character '6' for underdosing — never with a poisoning code.

NOS vs NEC
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NOS = Not Otherwise Specified (= unspecified; lacking detail). NEC = Not Elsewhere Classifiable (the detail exists but no specific code is available).

Etiology/manifestation convention
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When 'code first' and 'use additional code' appear together, the etiology is sequenced first and the manifestation second; manifestation codes are never first-listed.

HCPCS Level II
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An alphanumeric code set (A–V) for products, supplies, and services not in CPT — drugs, DME, ambulance, prosthetics, orthotics, and supplies.

HCPCS J codes
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Report injectable/infusion drugs and their dosage amounts (e.g., a J code for a specific drug per unit) — pair with the CPT administration code.

HCPCS vs CPT
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CPT (HCPCS Level I) reports physician/outpatient procedures; HCPCS Level II reports supplies, drugs, and equipment not described by CPT.

HCPCS modifiers
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Level II modifiers are alphanumeric (e.g., LT/RT for left/right, GA for ABN on file, the X{EPSU} subset of modifier 59) and refine the service.

Sequela (late effect)
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A residual condition produced after the acute phase of an injury/illness has ended; coded with the condition first, then the cause with 7th character S.

Default code (ICD-10-CM Index)
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The code listed next to the main term in the Alphabetic Index — used when the documentation doesn't specify a more detailed condition.

Acute vs chronic same condition
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When both acute and chronic forms are documented and separately indexed at the same indentation, code BOTH, sequencing the ACUTE/subacute first.

Impending/threatened condition
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If it occurred, code as a confirmed diagnosis; if it did not, reference the Index for 'impending' or 'threatened' and code the underlying signs/symptoms.

Coding for diabetes mellitus
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Use the combination codes in E08–E13 by type and the manifestation/complication; 'with' presumes a causal link unless documentation states otherwise.

Neoplasm table columns
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Malignant primary, malignant secondary, Ca in situ, benign, uncertain behavior, and unspecified — select the column matching the documented behavior.

Coding the reason for the encounter
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List first the diagnosis/condition chiefly responsible for the services provided (first-listed diagnosis in the outpatient setting).

Chronic conditions coding
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Chronic conditions treated on an ongoing basis may be coded as many times as the patient receives treatment for them.

External cause codes (V–Y)
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Optional ICD-10-CM codes describing how an injury happened, the place, activity, and status; never sequenced first.

ICD-10-CM code length
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3 to 7 characters; the first character is a letter, the second is a number, and a decimal follows the third character when more characters are present.

'In diseases classified elsewhere'
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A manifestation-code title that means the code is never first-listed; it must follow the underlying etiology code.

HCPCS A codes
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Transportation/ambulance, medical/surgical supplies, and administrative/miscellaneous services.

HCPCS E codes
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Durable medical equipment (DME) — wheelchairs, hospital beds, walkers, and similar reusable equipment.

HCPCS G codes
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Temporary procedure/professional service codes established by CMS, often for Medicare-specific services not yet in CPT.

HCPCS Q codes
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Temporary codes for drugs, biologicals, and certain services/supplies assigned by CMS.

ABN-related HCPCS modifiers
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GA (waiver of liability/ABN on file), GX (voluntary ABN), GY (statutorily excluded), GZ (expected denial, no ABN).

Primary vs secondary diagnosis (outpatient)
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First-listed = the main reason for the encounter; secondary diagnoses are coexisting conditions that affect treatment at this visit.

Aftercare Z codes
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Used for routine, planned care during the healing/recovery phase (e.g., attention to an artificial opening); not for active injury treatment, which uses 7th character A.

Coding for screening encounters
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Z11–Z13 screening codes are first-listed when the visit is solely for screening; any finding may be added as a secondary code.

Modifier LT / RT
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HCPCS Level II modifiers indicating the left (LT) or right (RT) side; used to identify which side a one-sided procedure was performed on.

Coding Guidelines, Modifiers & Compliance (62)

Modifier 25
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A significant, separately identifiable E/M service by the same provider on the same day as a procedure — billed in addition to the procedure.

Modifier 59
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Distinct procedural service — flags a procedure not normally reported together that is appropriate here (separate session, site, or lesion).

Modifier 51
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Multiple procedures performed at the same session by the same provider — appended to the secondary/lesser procedures (the primary is reported without it).

X{EPSU} modifiers
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More specific subsets of modifier 59: XE (separate encounter), XS (separate structure), XP (separate practitioner), XU (unusual non-overlapping service).

Modifier 50
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Bilateral procedure — one procedure performed on both sides of the body in the same operative session.

Modifier 22
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Increased procedural services — work substantially greater than typically required; requires supporting documentation.

Modifier 52 vs 53
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52 = reduced services (procedure partially reduced/eliminated at provider discretion); 53 = discontinued procedure (stopped due to patient risk after anesthesia/start).

Modifiers 58 / 78 / 79
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58 = staged/related procedure in the global period; 78 = unplanned return to the OR for a related problem; 79 = unrelated procedure during the global period.

Add-on codes (+)
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Reported in addition to a primary procedure code, never alone, and are modifier-51 exempt. The '+' symbol designates them in CPT.

Modifier 51 exempt codes
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Marked with the ⊘ symbol; add-on codes and certain others are exempt from multiple-procedure reduction — do not append modifier 51.

CPT symbol: ● (filled circle)
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Indicates a NEW code added to CPT for the current edition.

CPT symbol: ▲ (triangle)
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Indicates a code whose DESCRIPTOR was REVISED in the current edition.

CPT semicolon convention
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The text before the semicolon is the common (parent) description shared by the indented child codes that follow; read the parent + indented portion together.

CPT symbols ◄ ►
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Enclose NEW or REVISED text within the guidelines or a code descriptor in the current edition.

# (pound/hash) CPT symbol
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Marks a RESEQUENCED code — placed out of numeric order to keep it with related codes.

Unlisted procedure codes
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Used when no specific CPT code describes the service; require a special report (operative note) and are governed by the section guidelines for that CPT range.

Category I vs II vs III CPT
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Category I = standard 5-digit procedure codes; Category II = optional performance-measurement tracking codes (4 digits + F); Category III = temporary emerging-technology codes (4 digits + T).

NCCI PTP edits
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National Correct Coding Initiative procedure-to-procedure edits prevent improper code pairs (unbundling); a modifier indicator shows whether a modifier (e.g., 59) may override.

Medically Unlikely Edits (MUE)
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NCCI limits on the maximum units of a code reportable for one patient on one day — flag claims exceeding the expected unit count.

Unbundling
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Reporting components of a service separately to gain higher payment when a single comprehensive code applies — a compliance/fraud risk that NCCI edits target.

Upcoding
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Assigning a higher-level or more expensive code than the documentation supports — fraud; never code beyond what the record shows.

Medical necessity
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A service must be reasonable and necessary for the diagnosis or treatment; the ICD-10-CM diagnosis must support the CPT/HCPCS procedure billed.

Advance Beneficiary Notice (ABN)
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A notice given to a Medicare patient before a service likely to be denied as not medically necessary, transferring financial responsibility; signaled by modifier GA.

LCD vs NCD
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NCD = national coverage determination (CMS, nationwide); LCD = local coverage determination (set by a Medicare Administrative Contractor for its region).

Fraud vs abuse
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Fraud = knowing/intentional deception for unauthorized benefit; abuse = practices inconsistent with sound fiscal/medical practice causing unnecessary cost (intent is the key difference).

False Claims Act
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Federal law imposing liability for knowingly submitting false or fraudulent claims to the government (e.g., Medicare); a core CPC compliance topic.

OIG (HHS)
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The Office of Inspector General — investigates health-care fraud/abuse and publishes compliance program guidance and the annual Work Plan.

Compliance program (7 elements)
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OIG's voluntary program elements: written policies, a compliance officer, training, communication, auditing/monitoring, enforcement/discipline, and corrective action.

CPC open-book rule
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The exam allows the CPT, ICD-10-CM, and HCPCS Level II code books only — tab and index them in advance; 100 questions in 4 hours is ~2.4 minutes each.

CPC passing score
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70% — at least 70 of the 100 multiple-choice questions correct.

CPC-A (apprentice)
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Designation for a coder who passes the CPC without the required experience; the '-A' is removed once 2 years of experience (or the alternate path) is documented.

Modifier 26
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Professional component — the physician's interpretation and report portion of a service that has both a professional and technical component.

Modifier 76 vs 77
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76 = repeat procedure by the SAME physician; 77 = repeat procedure by a DIFFERENT physician.

Modifier 24
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Unrelated E/M service by the same physician during a postoperative (global) period.

Telehealth modifier 95
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Synchronous telemedicine service rendered via real-time interactive audio and video; the ★ symbol flags CPT codes eligible for synchronous telemedicine.

Modifier 47
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Anesthesia by the surgeon — appended to the surgical code when the operating surgeon also provides regional/general anesthesia (not the anesthesia codes).

Modifier 32
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Mandated services — a service required by a third party (e.g., payer, governmental, or regulatory mandate).

Modifier 62
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Two surgeons — each acting as a primary (co-)surgeon for distinct parts of the same procedure; each appends modifier 62.

Modifier 80 / 81 / 82
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80 = assistant surgeon; 81 = minimum assistant surgeon; 82 = assistant surgeon when a qualified resident is unavailable.

Modifier 66
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Surgical team — a highly complex procedure requiring several physicians of different specialties working together.

Modifier 90 / 99
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90 = reference (outside) laboratory; 99 = multiple modifiers (when more modifiers apply than the claim line allows).

Modifier ordering
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Pricing/payment modifiers (e.g., 26, 50, 51, 80) are generally listed before informational/statistical modifiers on the claim.

Special report
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Documentation accompanying an unlisted, new, or rarely used service that describes the nature, extent, need, time, and effort of the procedure.

CPT index search strategy
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Look up the procedure/service, anatomic site, condition, synonym, or eponym in the alphabetic Index, then VERIFY the code in the main (tabular) text — never code from the Index alone.

Bundling/global concept
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Services integral to a procedure (prepping, closing, routine post-op) are bundled into the surgical code and not reported separately.

EHR cloning / cut-and-paste risk
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Copying forward documentation that doesn't reflect the current encounter can support an inaccurate code and is a compliance/audit risk.

Stark Law (physician self-referral)
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Prohibits a physician from referring designated health services payable by Medicare to an entity with which they have a financial relationship, absent an exception.

Anti-Kickback Statute
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Criminal law prohibiting knowingly offering/paying/soliciting/receiving remuneration to induce referrals for items/services payable by a federal health-care program.

HIPAA in coding
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Protects patient health information; coders access only the minimum necessary PHI to assign and report codes.

Place of service (POS) codes
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Two-digit codes identifying where a service was furnished (e.g., 11 office, 21 inpatient hospital, 22 outpatient hospital, 23 ED); affects payment.

Clean claim
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A claim with no defects or missing information that can be processed without additional documentation; reduces denials and delays.

Modifier 73 / 74 (ASC/hospital outpatient)
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73 = discontinued outpatient procedure BEFORE anesthesia; 74 = discontinued AFTER anesthesia administration (facility reporting).

CCI modifier indicator
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On an NCCI PTP edit, an indicator of 0 = no modifier allowed (always bundled); 1 = a modifier may bypass the edit when clinically appropriate; 9 = edit not applicable.

CPC certifying body
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AAPC — the credentialing organization for the Certified Professional Coder; CPC is the standard for physician/outpatient (professional-fee) coding.

CPC vs CCS
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CPC (AAPC) = physician/outpatient, CPT+HCPCS heavy. CCS (AHIMA) = hospital facility/inpatient, ICD-10-PCS and MS-DRG heavy. Different bodies, different settings.

CPC exam length
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100 multiple-choice questions in 4 hours, open-book with the CPT, ICD-10-CM, and HCPCS Level II code books.

RBRVS / MPFS
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The Resource-Based Relative Value Scale underlying the Medicare Physician Fee Schedule; payment is based on work, practice-expense, and malpractice RVUs, adjusted geographically and multiplied by a conversion factor.

Relative value unit (RVU)
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The unit measuring the resources for a service under RBRVS: physician work, practice expense, and malpractice components.

Modifier 27
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Multiple outpatient hospital E/M encounters on the same date (facility reporting).

Modifier 33
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Preventive services — identifies a service furnished as a recommended preventive benefit (often waiving cost-sharing).

Bilateral vs unilateral codes
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Some CPT/ICD codes are inherently bilateral (don't add modifier 50); read the descriptor before appending laterality.

Add-on code rule (reporting)
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Always reported with its designated primary procedure on the same claim; never reported as a standalone service.

References

  1. 1.AAPC. “Certified Professional Coder (CPC) Certification.” aapc.com. ↑
  2. 2.American Medical Association. “CPT (Current Procedural Terminology).” ama-assn.org. ↑
  3. 3.CDC / National Center for Health Statistics. “ICD-10-CM Official Guidelines for Coding and Reporting.” cdc.gov. ↑
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