COC Outpatient Coding
Certified Outpatient Coder (COC™)
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The Certified Outpatient Coder (COC™) credential, offered by AAPC, validates expertise in coding for outpatient hospital and facility services. Earning it demonstrates proficiency in ICD-10-CM, CPT®, and HCPCS Level II coding for outpatient encounters, including same-day surgeries, emergency department visits, and hospital outpatient clinic services, in compliance with official guidelines and payer requirements. It suits new entrants to medical coding who want to begin in outpatient hospital and facility coding, experienced but uncertified coders seeking to validate their skills, certified coders expanding into outpatient facility and hospital-based coding, and healthcare professionals transitioning into outpatient coding, auditing, or compliance roles. The exam content spans four areas: core outpatient coding knowledge (diagnosis coding in the outpatient setting, CPT® and HCPCS Level II coding for procedures, services, and supplies, and outpatient reimbursement methodologies including APCs); outpatient documentation and compliance (documentation accuracy, specificity, and medical necessity, payer guidelines, NCCI edits, federal regulations, and incomplete documentation); facility-based outpatient services (same-day surgeries, endoscopies, emergency department visits, observation services, and hospital-based outpatient clinics); and revenue cycle and reimbursement (revenue code linkage, APC assignment, denial prevention, and the coder's role in hospital revenue cycle management). AAPC recommends high-level knowledge of medical terminology, anatomy, and pathophysiology before sitting. Preparation options include a self-paced or virtual instructor-led COC preparation course, with exam vouchers starting at $425 and prep training starting at $2,195.
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About COC Outpatient Coding preparation
How is the COC exam delivered?
AAPC states you can choose to take the exam online at home with a live remote proctor or at a testing center. You purchase an exam voucher first, then use it to view available dates and times and schedule your sitting.
What does the COC exam cost?
Exam vouchers start at $425 according to AAPC's COC page. If you also want structured preparation, self-paced and virtual instructor-led COC prep courses start at $2,195. Confirm current pricing with AAPC before purchasing, since starting prices can change.
What topics should I study, and in what order?
AAPC lists four content areas: core outpatient coding knowledge, outpatient documentation and compliance, facility-based outpatient services, and revenue cycle and reimbursement. A sensible order is diagnosis and procedure coding fundamentals first, then documentation and compliance rules such as NCCI edits, then facility-specific services, then revenue codes and APC assignment.
Do I need coding experience before taking the COC?
AAPC describes the expectation as a high-level knowledge of medical terminology, anatomy, and pathophysiology, plus understanding of proper application of CPT®, HCPCS Level II, and ICD-10-CM codes. If you are not ready, AAPC recommends its COC preparation course. AAPC also notes that completing the COC online prep course waives 80 hours of coding education, which waives one year of work experience toward apprentice status removal.
How hard is the exam, and where do candidates typically struggle?
AAPC does not publish a pass rate or difficulty rating, so treat claims about pass rates with suspicion. Based on the published content outline, the areas that trip people up are usually the facility-specific material, such as same-day surgery, endoscopy, emergency department, and observation coding, and revenue cycle topics like linking codes to revenue codes and APC assignment, which physician-office coders rarely encounter.
What happens if I fail - can I retake it?
AAPC's COC page does not state a retake policy, number of attempts, or retake fees. Check your voucher terms and contact AAPC customer service directly for the current retake rules before you schedule.
How long is the exam and what is the passing score?
Those details are not published on the COC overview page. AAPC provides them with the exam voucher and scheduling information, so review the details shown when you purchase and schedule rather than relying on secondhand figures.
How do I keep the COC once I earn it?
You must maintain your AAPC annual membership and earn 36 continuing education units every two years. Plan your CEUs across the full cycle rather than cramming at the end, and keep documentation of each activity in case of audit.
Does the COC cover physician office coding like the CPC?
No. AAPC distinguishes them clearly: the CPC preparation course teaches physician office coding, while the COC preparation course teaches coding for an outpatient hospital or facility setting. If your work is in physician practices, the CPC is the better fit; choose the COC for hospital outpatient and facility-based coding.