Your FREE CPC Flashcards 2026 – 200+ Cards

CPC Flashcards

Modifier 25

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

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

CPT code set

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)

10000 Integumentary, 20000 Musculoskeletal, 30000 Respiratory/Cardiovascular/Hemic-Lymphatic, 40000 Digestive, 50000 Urinary/Genital/Maternity, 60000 Endocrine/Nervous/Eye/Auditory.

10000 series CPT

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

How is a benign skin lesion excision coded?

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

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

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

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

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

Fracture care: open vs closed treatment

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

Respiratory, Cardiovascular, Hemic & Lymphatic, and Mediastinum & Diaphragm systems.

Cardiac catheterization coding

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

40000 series CPT

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

Endoscopy 'extent' rule

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

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

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

Global obstetric (maternity) package

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

Endocrine, Nervous, Eye & Ocular Adnexa, and Auditory systems.

Global surgical package

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)?

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

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

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

Debridement coding

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

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

59025 = fetal non-stress test, reported separately from the global OB package.

Evaluation and Management (E/M)

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

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

(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)

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

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)

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

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)

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

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)

'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)

+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

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

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

Anesthesia time reporting

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

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)

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

Qualifying circumstances (anesthesia)

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

Radiology component coding

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

Modifier 26 vs TC

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

Contrast 'with contrast' rule

'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)

Codes that report the imaging guidance and interpretation portion of a procedure, often paired with the surgical/injection CPT code.

Pathology & Laboratory panels

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)

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

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)

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

Vaccine coding: two codes

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

Therapeutic vs diagnostic injection

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

Prefix 'hyper-' vs 'hypo-'

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

Suffix '-ectomy'

Surgical removal/excision (e.g., appendectomy = removal of the appendix).

Suffix '-otomy' vs '-ostomy'

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

Suffix '-plasty'

Surgical repair or reconstruction (e.g., rhinoplasty = repair of the nose).

Suffix '-itis'

Inflammation (e.g., appendicitis, gastritis).

Prefix 'a-/an-'

Without or absence of (e.g., apnea = without breathing).

Combining form 'cardi/o'

Heart (e.g., cardiomyopathy = disease of the heart muscle).

Combining form 'nephr/o' vs 'ren/o'

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

Anatomical position planes

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

Directional terms

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

Body cavities

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

Abdominal quadrants

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

Integumentary system layers

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

Major body systems (coding-relevant)

Integumentary, musculoskeletal, respiratory, cardiovascular, digestive, urinary, reproductive, endocrine, nervous, and special senses — mirror the CPT surgery sections.

ICD-10-CM

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)

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

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

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

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

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

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

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)

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

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

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

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

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

Etiology/manifestation convention

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

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

HCPCS J codes

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

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

HCPCS modifiers

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.

Modifier 51

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

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

Modifier 50

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

Modifier 22

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

Modifier 52 vs 53

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

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 (+)

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

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)

Indicates a NEW code added to CPT for the current edition.

CPT symbol: ▲ (triangle)

Indicates a code whose DESCRIPTOR was REVISED in the current edition.

CPT semicolon convention

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 ◄ ►

Enclose NEW or REVISED text within the guidelines or a code descriptor in the current edition.

# (pound/hash) CPT symbol

Marks a RESEQUENCED code — placed out of numeric order to keep it with related codes.

Unlisted procedure codes

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

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

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)

NCCI limits on the maximum units of a code reportable for one patient on one day — flag claims exceeding the expected unit count.

Unbundling

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

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

Medical necessity

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)

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

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

Fraud vs abuse

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

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

OIG (HHS)

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

Compliance program (7 elements)

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

CPC open-book rule

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

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

CPC-A (apprentice)

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

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

Modifier 76 vs 77

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

Modifier 24

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

Telehealth modifier 95

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

Mohs micrographic surgery

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)

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

Breast biopsy vs mastectomy

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

Application of casts and strapping

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

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

Bronchoscopy coding

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)

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

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

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

Cholecystectomy coding

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

Cystourethroscopy

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

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

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

Craniectomy vs craniotomy

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

Cataract extraction coding

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

Tympanostomy

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

Endocrine surgery (thyroid)

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

Subsequent hospital care

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

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

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

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

99304–99318 report nursing-facility initial and subsequent care visits.

Home/residence E/M

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

Chronic care management (CCM)

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)

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

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

Counseling/coordination dominance (legacy)

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

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

Problems addressed in MDM

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

Monitored anesthesia care (MAC)

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

Anesthesia provider modifiers

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

Moderate (conscious) sedation

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

Radiology subsections

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

Radiation oncology coding

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

Nuclear medicine coding

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

Drug testing (presumptive vs definitive)

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

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

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

Cardiovascular medicine codes

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

Dialysis coding

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

Physical medicine & rehab

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

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

Psychiatry codes

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

Allergy coding

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

Suffix '-pexy'

Surgical fixation or suspension (e.g., nephropexy = fixation of the kidney).

Suffix '-rrhaphy'

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

Suffix '-scopy' vs '-graphy'

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

Suffix '-centesis'

Surgical puncture to remove fluid (e.g., thoracentesis, amniocentesis).

Suffix '-lysis'

Breakdown, destruction, or freeing from adhesions (e.g., adhesiolysis).

Prefix 'brady-' vs 'tachy-'

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

Prefix 'dys-'

Painful, difficult, or abnormal (e.g., dysphagia = difficulty swallowing).

Combining form 'hepat/o'

Liver (e.g., hepatomegaly = enlargement of the liver).

Combining form 'oste/o'

Bone (e.g., osteoarthritis, osteotomy).

Combining form 'cyt/o' vs 'hist/o'

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

Combining form 'enter/o' vs 'gastr/o'

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

Combining form 'pneum/o' vs 'pulmon/o'

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

Cardiovascular anatomy: chambers

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

Respiratory tract order

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

Digestive tract order

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

Urinary system order

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

Skeletal divisions

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

Muscle types

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

Sequela (late effect)

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)

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

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

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

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

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

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

Chronic conditions coding

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)

Optional ICD-10-CM codes describing how an injury happened, the place, activity, and status; never sequenced first.

ICD-10-CM code length

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'

A manifestation-code title that means the code is never first-listed; it must follow the underlying etiology code.

HCPCS A codes

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

HCPCS E codes

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

HCPCS G codes

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

HCPCS Q codes

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

ABN-related HCPCS modifiers

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

Modifier 47

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

Modifier 32

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

Modifier 62

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

Modifier 80 / 81 / 82

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

Modifier 66

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

Modifier 90 / 99

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

Modifier ordering

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

Special report

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

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

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

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)

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

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

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

Place of service (POS) codes

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

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)

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

CCI modifier indicator

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

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

CPC vs CCS

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

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

RBRVS / MPFS

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)

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

Modifier 27

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

Modifier 33

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

Operative report components

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.

Primary vs secondary diagnosis (outpatient)

First-listed = the main reason for the encounter; secondary diagnoses are coexisting conditions that affect treatment at this visit.

Aftercare Z codes

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

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

Bilateral vs unilateral codes

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

Concurrent care

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

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

Greatest clinical diameter

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

Surgical vs diagnostic endoscopy

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

Modifier LT / RT

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

Add-on code rule (reporting)

Always reported with its designated primary procedure on the same claim; never reported as a standalone service.