COC Study Guide 2026
Everything you need to pass the COC exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 COC Exam Format at a Glance
📚 COC Topics to Study (23)
✍️ Sample COC Questions & Answers
1. Modifier -KX is used in Medicare billing to indicate:
Modifier -KX attests that the specific coverage criteria for the billed item or service have been met and that the required documentation is on file.
2. Under the OIG Work Plan, which of the following would be a common audit target for outpatient coding?
The OIG routinely targets providers who bill a disproportionately high frequency of the highest-level E/M codes, which may indicate upcoding.
3. Which modifier is appended to a CPT code to indicate that a procedure was performed on the right side of the body?
Modifier -RT (Right Side) is used to indicate a procedure was performed on the right side of the body.
4. Which modifier indicates a co-surgery situation where two surgeons perform distinct parts of a procedure simultaneously?
Modifier -62 (Two Surgeons) is used when two surgeons each perform a distinct part of a reportable procedure, each reporting the same CPT code with modifier -62.
5. A myocardial infarction (MI) occurs when:
An MI occurs when a coronary artery is blocked (usually by a thrombus), cutting off blood supply to a region of myocardium, causing ischemia and ultimately tissue necrosis.
6. What does the STARK Law (Physician Self-Referral Law) prohibit?
The Stark Law prohibits physicians from referring Medicare/Medicaid patients to entities in which the physician or an immediate family member has a financial relationship, for designated health services.