1.1 Current COC Exam Facts
Key Takeaways
- AAPC's Taking the COC exam page lists 100 multiple-choice questions, four hours, and a 70% pass (70 of 100 correct; more than 30 wrong fails).
- AAPC prices the COC exam at $425 for one attempt or $499 for two attempts on the same page.
- AAPC publishes 10 domains; surgery and modifiers is the largest at 22 questions, then ICD-10-CM at 15, then payment methodologies and CPT at 13 each.
- AAPC posts results in 7–10 business days in My AAPC; failing candidates see categories with sub-scores of 65% or less.
- AAPC requires annual membership plus 36 CEUs every two years to keep COC; 2026 AAPC membership pages list annual dues of $229.
Current COC Exam Facts
Quick Answer: The American Academy of Professional Coders (AAPC) Certified Outpatient Coder (COC) exam is 100 multiple-choice questions in four hours. AAPC's Taking the COC exam page requires a 70% pass (70 of 100 correct; more than 30 wrong is a fail). One attempt is $425; two attempts are $499. AAPC lists 10 domains, with surgery and modifiers the largest at 22 questions.
The COC is AAPC's core credential for hospital outpatient and ambulatory surgery center (ASC) facility coding. This independent OpenExamPrep guide helps learners study for AAPC's COC. It is not an AAPC product, and OpenExamPrep does not claim partnership, official review, or approval by AAPC or the Centers for Medicare & Medicaid Services (CMS).
Why these logistics belong in week one of study
Facility coding jobs post "COC required or preferred" because the work is not physician-office professional coding. You will assign Current Procedural Terminology (CPT), International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM), and Healthcare Common Procedure Coding System (HCPCS) Level II codes to same-day surgery, emergency department (ED) visits, observation stays, and hospital outpatient clinic encounters, then connect those codes to revenue codes and Outpatient Prospective Payment System (OPPS) / Ambulatory Payment Classification (APC) logic. If you walk in knowing only professional Evaluation and Management (E/M) leveling, the 13 payment-methodology items and the 22 surgery-and-modifiers items will consume your four-hour clock.
Treat AAPC's published numbers as study-budget rules, not trivia. Surgery and modifiers is 22 of 100 items. ICD-10-CM is 15. Payment methodologies and the general CPT domain are 13 each. Those four buckets are 63 questions — enough to pass or fail on their own if the remaining 37 are mixed.
Published exam format
AAPC administers the COC as a single sitting. You may test at a testing center or at home with a live remote proctor. Every scored item is multiple-choice. AAPC states you have about 2.4 minutes per question.
| Detail | AAPC published information |
|---|---|
| Questions | 100 multiple-choice |
| Time | 4 hours, one sitting |
| Pace | About 2.4 minutes per question |
| Passing score | 70% (at least 70 correct) |
| Fail rule | More than 30 incorrect answers |
| Fee | $425 (one attempt) or $499 (two attempts) |
| Results | 7–10 business days in My AAPC under My Exams |
| Fail feedback | Categories with sub-scores of 65% or less |
| Certificate | Mailed after you pass |
AAPC's exam-cost support page also lists student voucher prices ($400 one attempt / $475 two attempts) and different prices for specialty exams. Use the Taking the COC exam page as the COC-specific fee unless your cart actually shows a student rate.
AAPC states that each certification exam measures only the named credential. Passing COC does not award Certified Professional Coder (CPC), Certified Inpatient Coder (CIC), or Certified Ambulatory Surgery Center Coder (CASCC). Those require their own exams.
Experience AAPC publishes — and what it does not
AAPC's COC credential page lists experience as high-level knowledge of medical terminology, anatomy, and pathophysiology, plus proper application of CPT, HCPCS Level II, and ICD-10-CM. AAPC does not publish a college-degree requirement on that page. AAPC recommends its COC training course if you are not ready. Do not invent a "two years in a hospital" gate that AAPC does not print.
The 10 official domains
AAPC's Taking the COC exam page is the source for the 10-domain breakdown. Do not substitute a collapsed marketing topic list for this table when you plan hours.
| Domain | Questions | What AAPC says this tests |
|---|---|---|
| Medical terminology | 7 | Terminology for all body systems |
| Anatomy | 7 | Anatomy for all body systems |
| Coding guidelines | 3 | ICD-10-CM Official Guidelines for Coding and Reporting, CPT guidelines and parenthetical notes, and modifier use |
| Payment methodologies | 13 | Medicare Parts A, B, C, and D; Medicare as secondary payer; OPPS and Inpatient Prospective Payment System (IPPS); UB-04 and CMS-1500 completion |
| Compliance | 3 | National Coverage Determinations (NCDs) / Local Coverage Determinations (LCDs), Health Insurance Portability and Accountability Act (HIPAA), and Advance Beneficiary Notices (ABNs) |
| ICD-10-CM | 15 | Diagnosis coding across ICD-10-CM chapters plus the Official Guidelines; diagnosis also appears inside CPT-category items |
| HCPCS Level II | 7 | Modifiers, supplies, medications, and professional services for Medicare patients |
| CPT | 13 | E/M, surgery, radiology, pathology/laboratory, and medicine |
| Surgery and modifiers | 22 | Procedures approved for outpatient hospital and ASC facilities |
| Cases | 10 | Ten cases, one question each: code the record with CPT, ICD-10-CM, and HCPCS Level II |
AAPC notes that diagnosis questions also appear in other sections from the CPT categories. A 15-question ICD-10-CM domain is not the only place a wrong first-listed diagnosis can cost you a point.
How a facility coder should read the weights
- Surgery and modifiers (22) is operative-report work: approach, laterality, discontinued procedures, bilateral reporting, and facility-relevant modifiers — not the professional global surgical package you may have memorized for CPC-style professional billing.
- ICD-10-CM (15) plus diagnosis hidden in other items rewards outpatient Section IV habits (first-listed diagnosis, do not code "possible" or "rule out" as if confirmed).
- Payment methodologies (13) is the trap for physician-office candidates: Part A versus Part B, OPPS versus IPPS, Medicare as secondary payer (MSP), and which claim form a hospital outpatient department uses (UB-04 institutional versus CMS-1500 professional).
- CPT (13) still includes E/M, radiology, pathology/laboratory, and medicine. Facility clinic visits for Medicare often involve HCPCS such as G0463 rather than a professional office E/M code — later chapters teach that distinction. Do not skip radiology technical-component thinking or infusion hierarchy because "surgery is 22."
- Cases (10) sit at the end of the exam. Each case is one scored question built from a medical record. If you average 2.4 minutes everywhere and then meet a two-page operative note with no time left, that 10% block becomes guesswork.
Terminology (7) and anatomy (7) look small. They are not optional. AAPC writes that those items cover all body systems. A candidate who only drills gastrointestinal endoscopy will still see musculoskeletal, integumentary, and nervous-system terms.
Coding guidelines (3) and compliance (3) are small but dense. Three Official Guidelines items can include Excludes1 versus Excludes2, code-first notes, or first-listed diagnosis. Three compliance items can be NCD versus LCD, HIPAA minimum necessary, or ABN liability. Missing all six is not fatal by itself; missing them and running weak on payment and surgery is how people land over 30 wrong.
The 70/100 math in facility language
You may miss 30 items. You may not miss 31. AAPC does not publish a domain-level passing score. You can theoretically miss every compliance item and still pass if the other 97 are strong — and you can still fail with excellent surgery if payment, ICD-10-CM, and cases collapse together. After a fail, AAPC tells you which categories scored 65% or less so you know where to restudy. That disclosure is a retest tool, not a second grade. Results appear in 7–10 business days on the My AAPC dashboard under My Exams. The certificate is mailed after you pass.
After you pass: membership and CEUs
AAPC's COC credential page requires AAPC annual membership and 36 continuing education units (CEUs) every two years to keep the credential. AAPC's 2026 membership pages (including the certified-new-member facts) state annual dues are $229. Budget the exam fee, dues, and current-year code books as one credential cost, not three surprises.
Candidate scenario: allocating 80 study hours
Maya abstracts for a hospital outpatient department. Her manager will pay one $425 attempt. She has eight weeks and about 80 hours.
She does not split 80 hours into 10 equal buckets. She maps hours to AAPC's published question counts:
- About 18 hours on surgery and modifiers (22 items), including operative-note practice for outpatient hospital and ASC-approved procedures
- About 12 hours on ICD-10-CM (15 items), emphasizing outpatient first-listed rules rather than inpatient uncertain-diagnosis habits
- About 10 hours on payment methodologies (13 items): OPPS/APC, UB-04, Medicare Parts A–D, and MSP
- About 10 hours on CPT non-surgery depth (13 items): ED and observation E/M, radiology technical component, and injections/infusions
- About 8 hours on mixed-record cases (10 items) with a timer
- Remaining hours on terminology, anatomy, HCPCS Level II, coding guidelines, and compliance
Maya's first untimed practice set is 90% on CPT surgery and 40% on payment. She restacks the calendar toward APCs and claim forms because 13 payment items plus shaky surgery would put her near 30 misses before the 10 cases even start.
Official AAPC pages to recheck before you schedule
Fees, domain counts, and book rules can change. Recheck the sponsor pages, not a screenshot from last year:
According to AAPC's Taking the COC exam page, how many items must a candidate answer correctly to pass?
On AAPC's published 100-question COC domain breakdown, which area has the most items?
If a candidate does not pass, which feedback does AAPC say it will provide?