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Health & emergency services

Medical coding: AAPC CPC and AHIMA CCA flashcards

7 decks · 489 cards · built into Willys · free samples below

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Written against: ICD-10-CM Official Guidelines and code set FY 2027 (effective 1 October 2026); CPT structure and E/M guidelines described in our own words; HCPCS Level II, NCCI and ICD-10-PCS per CMS. Updated 2026-10-10.

What's in it

Every deck follows the course outline, with tags you can study or suspend topic by topic. Open a deck to study its free sample right here.

Learn · 6 decks · 421 cards

Concepts, mechanisms and the questions a course or exam asks about them.

ICD-10-CM Conventions & General Guidelines ICD-10-CM Index and Tabular conventions, Excludes notes, sequencing instructions, the general coding guidelines, principal and first-listed diagnosis rules for inpatient and outpatient settings, and POA indicators (FY 2027). 10 free · 77 cards in the app ICD-10-CM Chapter Guidelines High-yield ICD-10-CM chapter rules: HIV, sepsis, neoplasms, diabetes, hypertension, MI timing, COPD, pregnancy and newborn coding, injuries and 7th characters, burns, poisoning versus adverse effect versus underdosing, external causes and Z codes (FY 2027). 10 free · 79 cards in the app CPT Structure & E/M CPT categories I, II and III, the six sections, guidelines, unlisted codes and symbols, then E/M: new versus established patients, MDM and time since 2021 and 2023, consultations, critical care, prolonged and preventive services. No CPT descriptors reproduced. 10 free · 62 cards in the app CPT Sections & Procedures The surgical package and Medicare global periods, separate procedures, lesion and repair coding, fractures and endoscopy, the anesthesia formula and modifiers, radiology components, lab panels and pathology, vaccines, infusions and dialysis. No CPT descriptors reproduced. 10 free · 63 cards in the app Modifiers & HCPCS Level II The modifiers coders use most (25, 57, 24, 78, 79, 58, 50, 51, 59 and the X modifiers, 76, 77, 91, assistant and co-surgeon), anatomic and liability-notice modifiers, and HCPCS Level II structure and sections. 10 free · 62 cards in the app ICD-10-PCS, Compliance & Reimbursement ICD-10-PCS structure, root operations, body part, approach and device rules (FY 2027), then HIPAA, the False Claims Act, Anti-Kickback and Stark laws, NCCI edits, ABNs, NCDs and LCDs, MS-DRGs, APCs, RBRVS, claim forms, the NPI and compliant queries. 10 free · 78 cards in the app

Practice · 1 deck · 68 questions

Multiple-choice practice questions, one best answer each, with the reasoning.

Practice Questions Multiple-choice practice questions, one best answer each, across ICD-10-CM conventions and chapter guidelines, inpatient and outpatient selection, CPT and E/M, procedure sections, modifiers, HCPCS Level II, ICD-10-PCS and compliance. 6 free · 68 questions in the app

Study guide

Topics covered

The decks follow the order of the course outline. Numbers are cards per topic.

  • ICD-10-CM Conventions 32
    • Index and Tabular 13
    • Instructional Notes 14
  • ICD-10-CM General Guidelines 24
  • Outpatient and Inpatient Selection 37
    • Inpatient 14
    • Outpatient 10
    • Present on Admission 7
  • ICD-10-CM Chapter Guidelines 93
    • Circulatory System 12
    • Endocrine and Metabolic 8
    • External Causes 3
    • Factors Influencing Health Status 5
    • Genitourinary System 2
    • Infectious Diseases 14
    • Injury and Poisoning 15
    • Mental and Behavioral 1
    • Neoplasms 12
    • Nervous System 2
    • Perinatal Conditions 4
    • Pregnancy and Childbirth 11
    • Respiratory System 2
    • Skin and Musculoskeletal 2
  • CPT Structure 24
    • Categories and Sections 13
    • Symbols and Conventions 7
  • Evaluation and Management 48
    • Decision Making and Time 17
    • Patient Status 4
    • Service Categories 21
  • CPT Sections 72
    • Anesthesia 14
    • Medicine 15
    • Pathology and Laboratory 8
    • Radiology 8
    • Surgery 27
  • Modifiers 42
    • Anatomic 4
    • Global Surgery and E/M 9
    • Liability Notices 4
    • Procedures and Distinct Services 19
  • HCPCS Level II 29
    • Sections 15
    • Structure 11
  • ICD-10-PCS 44
    • Body Part Approach and Device 12
    • Root Operations 19
    • Structure and Conventions 9
  • Compliance and Reimbursement 44
    • Edits and Coverage 8
    • Fraud and Abuse Laws 10
    • HIPAA 6
    • Payment Systems and Claims 10
    • Physician Queries 4

A study plan

  • 18 new cards a day covers everything in a month, leaving the last weeks for review.
  • 9 new cards a day covers everything in two months, leaving the last weeks for review.
  • 6 new cards a day covers everything in three months, leaving the last weeks for review.

Willys schedules reviews for you (FSRS spaced repetition), so the daily number above is only for new cards; reviews of what you have learned come back on their own. Study a topic's cards right after you meet it in class, suspend topics you have not reached yet, and use the app's quiz mode in the final two weeks.

How to get these decks

  1. Install Willys on your iPhone, iPad or Mac — App Store. 14-day free trial, then $14.99 a year.
  2. In Willys, tap Exam Library at the top of your Decks (or Browse Exam Library… under the + button), find the exam on its shelf or by search, tick it and tap Add.
  3. Study. The exam comes in as its own collapsible folder, every card scheduled by FSRS spaced repetition. Nothing you already have is changed.

Every deck is built into Willys

All 7 Medical coding: AAPC CPC and AHIMA CCA decks (489 cards), with FSRS spaced repetition, quizzes and mock tests, on iPhone, iPad and Mac. 14-day free trial, then $14.99 a year.

Get the app

In Willys, tap Exam Library at the top of your Decks (or Browse Exam Library… under the + button), find the exam on its shelf or by search, tick it and tap Add.

About these cards

Review status: Second-reader reviewed, with corrections applied.

Checked against:

  • ICD-10-CM codes and rules checked against the ICD-10-CM Official Guidelines for Coding and Reporting FY 2027 and the FY 2027 code files (CDC/NCHS and CMS, effective 1 October 2026; public domain). Code sets change every 1 October; check the current year's books.
  • CPC® is a registered trademark of AAPC, and CCA is a credential of AHIMA; neither is affiliated with, or endorses, this product.
  • CPT® is a registered trademark of the American Medical Association. No CPT descriptors are reproduced; CPT structure and guidelines are described in our own words.
  • HCPCS Level II codes and Medicare E/M policies checked against CMS publications (public domain).
  • CPT content checked in October 2026 against the AMA's published CPT pages and E/M guideline documents and against CMS publications that reproduce CPT (MLN006764, Medicare Claims Processing Manual ch. 12, NCCI Policy Manual 2026), not against the CPT 2026 Professional Edition.
  • Coding and Medicare payment rules checked against the NCCI Policy Manual for Medicare Services 2026 (revised 1 January 2026), the Medicare Claims Processing Manual (Pub. 100-04), Chapters 4, 5, 8, 12, 13, 16 and 18, the MLN Global Surgery booklet (MLN907166, December 2025), the CY 2022 Physician Fee Schedule final rule (86 FR 64996), Medicare contractor wound-care coding guidelines (LCD L34587 and L33566) and the October 2026 HCPCS Level II file (CMS, public domain).
  • HCPCS Level II codes and modifiers, NCCI policies and Medicare payment rules checked against CMS publications (public domain): the October 2026 alpha-numeric HCPCS file, the Medicare NCCI Policy Manual (2026) and the Medicare Claims Processing Manual, Chapters 4, 5, 8, 12, 14, 16, 18, 20, 23 and 26.
  • ICD-10-PCS items checked against the ICD-10-PCS Official Guidelines for Coding and Reporting 2027 and the FY 2027 code tables and definitions (CMS, public domain).
  • NCCI, ABN, coverage and payment items checked against the Medicare NCCI Policy Manual (2026) and other CMS publications (public domain). No yearly-changing payment amounts are given.
  • CPT® is a registered trademark of the American Medical Association. No CPT descriptors are reproduced.
  • HCPCS Level II, NCCI, Medicare and ICD-10-PCS items checked against the NCCI Policy Manual for Medicare Services 2026, the Medicare Claims Processing Manual (Pub. 100-04), the October 2026 HCPCS Level II file and the ICD-10-PCS Official Guidelines for Coding and Reporting 2027 and FY 2027 code tables (CMS, public domain).
  • Original questions written for this deck; no exam-owner, textbook or question-bank items were copied.

These are independent study notes written for Willys. They are not official exam material, may contain mistakes, and are no substitute for your course, your teacher or the exam owner's own publications. Found an error? Tell us — corrections ship as a new version of the deck.

Not coding, billing or compliance advice. These cards prepare you for a certification exam. Code sets change every year, so code real claims from the current ICD-10-CM, CPT® and HCPCS books and your payers' policies. No CPT descriptors are reproduced here.

CPT® is a registered trademark of the American Medical Association; no CPT descriptors are reproduced. CPC® is a registered trademark of AAPC, and CCA is a credential of AHIMA; neither is affiliated with, or endorses, this product.

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