CPC Exam Cheat Sheet — Free PDF Download

The Certified Professional Coder (CPC) exam covers an enormous amount of material — CPT coding across every section, ICD-10-CM diagnosis coding, HCPCS Level II, anatomy, medical terminology, compliance, and reimbursement. Having a condensed cheat sheet helps you review critical rules and patterns in the final days before your exam. This guide compiles the most tested concepts into quick-reference format so you can study smarter and walk into the exam with confidence.

This is not a substitute for in-depth study. If you need a full preparation roadmap, start with the CPC Exam Study Guide. Use this cheat sheet as a final review tool after you have completed your coursework and practice exams.

ICD-10-CM Quick Rules

ICD-10-CM diagnosis coding makes up roughly 20 questions on the CPC exam. These rules come up repeatedly.

Code Structure

ICD-10-CM codes follow a consistent structure: a letter followed by two digits, a decimal point, and up to four additional characters. The first three characters represent the category. Characters four through seven add specificity for etiology, anatomic site, severity, and other details. The seventh character is required for certain chapters, especially injuries, musculoskeletal conditions, and pregnancy.

Always code to the highest level of specificity. If a code requires a seventh character but the code itself is only four or five characters long, you must use the placeholder “X” to fill empty positions before placing the seventh character.

Sequencing Rules

The principal diagnosis is defined as the condition established after study to be chiefly responsible for the admission. In outpatient settings, the first-listed diagnosis is the reason for the encounter. These terms are not interchangeable. The CPC exam tests outpatient coding guidelines, so you will follow first-listed diagnosis rules unless a question specifically states an inpatient scenario.

When a patient presents with symptoms and no definitive diagnosis has been established, code the symptoms. Do not code “rule out,” “suspected,” or “probable” diagnoses in outpatient settings. This rule is tested frequently. For more on this distinction, see Principal vs First-Listed Diagnosis.

Key ICD-10-CM Conventions

Excludes1 notes indicate two conditions that cannot be reported together. If the patient truly has both conditions, check whether a combination code exists. Excludes2 notes mean “not included here” — the excluded condition can be coded separately if documented. The difference between these two note types is a common exam question. Review the full breakdown at Excludes1 vs Excludes2 Notes.

“Code first” and “use additional code” notes tell you the sequencing order. The condition with the “code first” note goes in the primary position. The condition with “use additional code” goes in a secondary position. “Code also” means report both codes, but sequencing depends on the circumstances of the encounter.

Combination codes capture two conditions or a condition with a complication in a single code. When a combination code exists, do not assign separate codes for each component. A common example is diabetes with a manifestation — the combination code from E08–E13 captures both. See Combination Codes ICD-10 for more detail.

High-Yield ICD-10 Topics

Certain ICD-10-CM chapters appear on the CPC exam more than others. Focus your review on these areas:

For detailed coding guidance on each of these topics, refer to Hypertension Coding, Diabetes Coding, Neoplasm Coding, Sepsis Coding, and Injury Coding and 7th Characters.

CPT Coding Quick Rules

CPT coding questions account for the largest portion of the CPC exam — roughly 70 out of 100 questions. Mastering these rules is essential.

Code Structure and Index Usage

CPT codes are five-digit numeric codes organized into six sections: Evaluation and Management (99202–99499), Anesthesia (00100–01999), Surgery (10004–69990), Radiology (70010–79999), Pathology and Laboratory (80047–89398), and Medicine (90281–99607). Always start your search in the CPT Index by looking up the procedure or service, then verify in the Tabular List. Never code directly from the Index. Read the full guidelines at the beginning of each section and subsection before selecting a code. For a deeper explanation, see How CPT Codes Are Structured.

Surgery Section Essentials

The surgery section represents the largest block of CPC exam questions. Key concepts include the global surgical package, which bundles pre-operative, intra-operative, and routine post-operative care into one code. Separate procedures — identified by the parenthetical “(separate procedure)” — are included in more comprehensive procedures performed in the same anatomic area during the same session. Report a separate procedure code only when it is performed independently or in a different anatomic area. See Global Surgical Package for a thorough review.

Modifier Essentials

Modifiers are appended to CPT codes to indicate that a service was altered by specific circumstances without changing the definition of the code. The CPC exam tests modifier knowledge heavily.

The difference between Modifier 25 and Modifier 57 is one of the most tested modifier concepts. Modifier 25 applies when a separate E/M service is performed on the same day as a minor procedure (0- or 10-day global period). Modifier 57 applies when the E/M service is the decision for a major surgery (90-day global period). See CPT Modifiers Guide for the full list with examples.

E/M Coding Quick Reference

Evaluation and Management coding was restructured in 2021. For office and outpatient visits (99202–99215), code selection is based on either medical decision making (MDM) or total time. Most CPC exam questions use MDM. The three elements of MDM are the number and complexity of problems addressed, the amount and complexity of data reviewed, and the risk of complications or morbidity.

New patient office visits use codes 99202–99205. Established patient visits use 99211–99215. The distinction depends on whether the patient has been seen by a provider of the same specialty within the same group in the past three years. See the full guide at E/M Coding Guide.

NCCI Edits and Bundling

The National Correct Coding Initiative (NCCI) edits define code pairs that should not be billed together. When two codes are bundled by NCCI edits, only the comprehensive code is reported unless the services are truly separate and distinct. Modifier 59 (or the more specific XE, XS, XP, XU modifiers) may be used to override an NCCI edit when documentation supports that the procedures were independent. Understanding bundling rules prevents claim denials. Review Bundled Codes & NCCI Edits for exam-focused practice.

HCPCS Level II Quick Reference

HCPCS Level II codes begin with a letter (A through V) followed by four digits. These codes cover supplies, equipment, drugs, and services not included in CPT. The CPC exam typically includes 5–10 HCPCS questions.

Key areas to know include J-codes for drugs administered by injection (e.g., J1234 for a specific injectable drug), A-codes for medical supplies, E-codes for durable medical equipment (DME), and L-codes for orthotics and prosthetics. HCPCS modifiers differ from CPT modifiers — for example, LT and RT are HCPCS modifiers indicating left or right side.

Anatomy and Medical Terminology Quick Hits

The CPC exam assumes a working knowledge of anatomy and medical terminology. You do not need to memorize every structure, but you should know the major body systems, anatomical planes, and directional terms well enough to interpret operative reports.

Key anatomical directional terms: superior (above), inferior (below), anterior (front), posterior (back), medial (toward midline), lateral (away from midline), proximal (closer to trunk), distal (farther from trunk). Know the three anatomical planes — sagittal (divides left/right), coronal/frontal (divides front/back), and transverse (divides top/bottom).

For medical terminology, focus on common prefixes, suffixes, and root words. Prefixes like “hyper-” (excessive), “hypo-” (under), “peri-” (around), and “endo-” (within) appear constantly in operative notes. Suffixes like “-ectomy” (removal), “-otomy” (incision into), “-ostomy” (creating an opening), “-plasty” (repair), and “-scopy” (viewing) tell you what procedure was performed. See Medical Terminology for Coders for a comprehensive list.

Compliance and Reimbursement

The CPC exam includes questions on healthcare compliance and the revenue cycle. Key areas include the difference between fraud (intentional deception) and abuse (practices inconsistent with accepted standards), the False Claims Act, the Anti-Kickback Statute, and HIPAA regulations.

Understand the claim submission process: charge capture, code assignment, claim generation, submission, adjudication, and payment posting. Know the difference between allowed amount, co-pay, coinsurance, and deductible. Coordination of benefits (COB) determines which insurance pays first when a patient has multiple payers.

The OIG (Office of Inspector General) publishes an annual Work Plan identifying areas targeted for audit. Compliance programs require written policies, a designated compliance officer, regular training, an anonymous reporting mechanism, consistent enforcement, and prompt corrective action.

CPC Exam Patterns to Watch For

Recognizing exam question patterns saves time and prevents errors. Here are the most common patterns you will encounter.

Pattern 1 — The Distractor Answer. The question presents four codes that look similar. Three codes differ by one detail — laterality, extent, or approach. Read the operative note carefully for anatomic specifics before selecting an answer.

Pattern 2 — The Modifier Trap. The question describes a scenario where two services were performed. One answer includes a modifier, another does not. Determine whether the services are bundled, whether they are on the same day, and which modifier correctly reflects the relationship between the services.

Pattern 3 — The Sequencing Question. The question describes multiple diagnoses. The answers list the same codes in different orders. Apply sequencing rules: code the reason for the encounter first in outpatient settings. Look for instructional notes like “code first” and “use additional code.”

Pattern 4 — The “Included” Service. The question describes a procedure plus an additional service that is routinely included in the primary procedure code. The correct answer does not code the additional service separately.

Pattern 5 — The Global Period Question. The question asks about a follow-up visit after surgery. If the visit falls within the global period and addresses the same condition, it is included in the surgical code. A new or unrelated condition during the global period requires a separate E/M code with Modifier 24.

Common Mistakes on the CPC Exam

Avoiding common mistakes is just as important as knowing the correct rules. These errors cost candidates points every exam cycle.

Coding from the Index without verifying in the Tabular List leads to incorrect code selection. The Index provides direction, but the Tabular List contains instructional notes, inclusion terms, and exclusion notes that change your code choice.

Not reading the full code description causes errors with indented codes. In CPT, indented (subordinate) codes share the beginning portion of the description from the parent code above. You must read the parent code’s description along with the indented code’s additional language to understand the full procedure being described.

Selecting the wrong E/M level by miscounting MDM elements is common. Remember that MDM has three components — problems, data, and risk — and two of three must meet or exceed the level being reported.

Confusing new patient versus established patient criteria results in wrong code selection. A new patient has not received professional services from the same physician or same specialty within the same group practice in the past three years.

Ignoring parenthetical notes in CPT is a frequent error. Parenthetical notes tell you when a code should not be reported with other codes, when a code has been deleted or moved, and which modifiers are appropriate. These notes appear immediately after the code description and are essential reading.

Misapplying the 7th character for injuries costs points. Remember: A is for the initial encounter (active treatment phase), D is for subsequent encounters (routine healing), and S is for sequela (a complication resulting from the original injury). The key distinction is that “initial” and “subsequent” refer to the phase of treatment, not whether the patient has been seen before.

A cheat sheet works best on top of a structured revision schedule. If you have not mapped out your prep yet, the 90-day CPC study plan breaks these same rules into a week-by-week timeline across all 17 domains.

Test Day Quick Tips

During the exam, manage your time by spending no more than one minute per question on your first pass. Flag difficult questions and return to them after completing the easier ones. The CPC exam allows you to use your code books, so tab them in advance with labeled sticky tabs for frequently referenced sections.

Tab the following sections at minimum: E/M guidelines (front of CPT), modifier appendix (Appendix A), surgery guidelines, ICD-10-CM conventions, the ICD-10-CM Table of Neoplasms, the ICD-10-CM Table of Drugs and Chemicals, and ICD-10-CM external cause codes.

Read each question carefully — CPC questions often contain one key detail buried in the middle of the stem that changes the correct answer. Operative report questions require you to identify the correct approach, the extent of the procedure, and the anatomic site before looking up the code. For more exam day strategies, see CPC Exam Day Strategy.

Topic Guides Behind These Quick Rules

Every quick rule on this page has a full guide with worked examples and exam patterns behind it. Bookmark the ones covering your weakest sections:

• Pathology & Laboratory Coding (CPT 80000 Series) — panels, drug testing, urinalysis, and surgical pathology levels
• Medicine Section CPT Coding (90000 Series) — immunizations, the infusion hierarchy, psychiatry, and diagnostic cardiology
• Global OB Package & Maternity CPT Coding — the four global codes, split care, and twin deliveries
• ICD-10 Pregnancy Coding: Chapter 15 O Codes — trimesters, Z3A, O80, and outcome of delivery codes
• Burn Coding in ICD-10: Rule of Nines — TBSA calculation, T31 extent codes, and burn sequencing
• Poisoning vs Adverse Effect vs Underdosing — the Table of Drugs and its three sequencing patterns
• Modifier 59 vs X Modifiers — distinct procedural services and NCCI edit bypassing
• Fracture Care CPT Coding — open vs closed treatment and the fracture global period
• Eye & Ear Procedure Coding — cataracts, ear tubes, and the operating microscope rule
• Compliance & Regulatory Guide — Medicare parts, ABNs, fraud vs abuse, and HIPAA
• Urinary & Genital System CPT Coding — cystoscopy bundling, TURP, and the hysterectomy code grid
• Nervous System CPT Coding — spinal injections, shunts, and carpal tunnel release
• Anesthesia Time & Payment Calculation — the B+T+M formula, physical status, and qualifying circumstances
• Mental Health ICD-10 F Codes — the substance hierarchy, depression coding, and dementia sequencing

Frequently Asked Questions