Which statement best describes the purpose of the ICD-10-CM Official Guidelines for Coding and Reporting?

• A. To list all ICD-10-CM codes.
• B. To authorize ICD-10-CM code usage by CMS.
• C. To provide coding rules, conventions, and sequencing guidance to ensure accurate and consistent coding.
• D. To define all medical terminology.

Answer: (C)

The essential idea here is that the ICD-10-CM Official Guidelines for Coding and Reporting provide the standardized rules, conventions, and sequencing guidance used when assigning and arranging ICD-10-CM diagnoses. These guidelines explain how to apply codes correctly, interpret instructions like when to code first or when an additional code is needed for manifestations, and how to sequence the principal versus secondary diagnoses when multiple conditions are present. This makes them the best answer because they ensure coding is accurate and consistent across settings, which supports proper reimbursement and reliable data for reporting and analysis. They are not simply a list of codes, they do not authorize code usage by CMS, and they do not define medical terminology.