AAPC Certified Outpatient Coder (COC) Examination Practice Test
Outpatient coding translates documentation for hospital and other ambulatory services into diagnosis and procedure codes. This practice page samples decisions involving first-listed diagnoses, imaging components, vaccine products and administration, discontinued procedures, pregnancy-related coding considerations, and annual code-set timing.
Exam overview
About the AAPC Certified Outpatient Coder (COC) Examination Exam
Accurate outpatient coding depends on following the Alphabetic Index with confirmation in the Tabular List, including its instructional notes and exclusions. Coders also distinguish the technical component of a diagnostic service from a separately billed interpretation, and separate a vaccine product code from administration work. Other scenarios require choosing the diagnosis chiefly responsible for the service, checking whether a documentation discrepancy needs resolution, and applying the code set effective for the service date. Procedure reporting may involve global surgical package concepts or a procedure stopped after anesthesia begins, where the circumstances and applicable coding rules matter. These tasks support complete, consistent facility claims and require careful reading of the record rather than assumptions based on the order alone.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
A patient has a diagnostic imaging study performed in a hospital outpatient department. The facility reports the technical component, while an independent physician interprets the images and bills separately. Which modifier is commonly used on the imaging code to identify the technical component?
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Correct answer: BModifier TC identifies the technical component of a diagnostic service, such as equipment, supplies, and technical staff. Modifier 26 identifies the professional interpretation component; the appropriate reporting depends on the service and payer rules.
A patient undergoes an outpatient service, and the record documents that the patient is pregnant. The pregnancy affects how the service is provided. What coding consideration is appropriate?
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Correct answer: BWhen pregnancy affects the care provided, applicable ICD-10-CM obstetric coding guidelines may require pregnancy-related coding and specific sequencing. The coder should follow the relevant guidelines rather than automatically omitting pregnancy or replacing other necessary codes.
A patient undergoes an outpatient procedure, and the provider documents a definitive diagnosis after evaluation. Which diagnosis should generally be reported as the first-listed diagnosis when it chiefly occasioned the service?
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Correct answer: BFor outpatient coding, the first-listed diagnosis is generally the condition, problem, or reason chiefly responsible for the services provided. A definitive diagnosis established after evaluation is ordinarily reported instead of related symptoms when applicable coding rules permit.
A coder is assigning a code from a code set that is updated annually. The service occurred near the start of a new code-set year. Which date is generally used to determine which code-set version applies to the claim?
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Correct answer: BFor code sets that change by effective date, the applicable version is generally determined by the date of service, subject to the specific code-set and payer rules. The claim-submission or record-signature date does not ordinarily determine the code-set year.
A hospital outpatient department reports a procedure code that has a global surgical package under the applicable rules. Which statement best describes the concept of a global package?
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Correct answer: AA global surgical package defines certain related services included in the package for the applicable code and rules. Its scope is limited; it does not automatically include all services or override rules for separately reportable services or different claim components.
A surgical service is documented as discontinued after the patient has been prepared and anesthesia has begun, but before the planned procedure is completed. What coding consideration is most important?
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Correct answer: BDiscontinued procedures have specific reporting rules that depend on the setting, timing, and circumstances. The coder should consult the applicable official coding guidance and report only the services supported by the record, rather than automatically reporting the planned procedure as completed.
A coder is assigning an ICD-10-CM code and the Alphabetic Index directs the coder to a different code category than initially expected. What is the proper next step?
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Correct answer: BThe Alphabetic Index is an entry point, not the final authority for code assignment. The coder should verify the code in the Tabular List and apply applicable inclusion terms, exclusions, and instructional notes.
How to use this practice test
The free practice bank contains 50 questions; each session presents up to 20 random questions. Use a session to check how you apply outpatient diagnosis selection, code-set conventions, modifiers, and procedure-reporting concepts to short scenarios. Results appear after the session, helping you identify which decisions to revisit.
Preparation tips
- For ICD-10-CM scenarios, trace the documented condition through the Alphabetic Index, then verify the candidate code and all notes in the Tabular List.
- Practice distinguishing a diagnostic imaging technical component from the professional interpretation, and identify when a modifier communicates the component billed.
- Compare vaccine product coding with administration coding so the supplied product and the work of giving it are not conflated.
- For discontinued procedures, note the documented stopping point, including whether anesthesia began, and consult the applicable reporting guidance before selecting a code or modifier.
- When an order and the performing provider’s documentation give different reasons for a test, identify the discrepancy and determine whether clarification is needed for diagnosis reporting.