Where can you find the official mapping tools referenced?

• A. ICD-10 CM Codebook
• B. Coding Clinic
• C. Project Guidelines
• D. CMS.gov

Answer: (D)

The key idea is where authoritative code mappings are maintained. Official crosswalks between ICD-9-CM and ICD-10-CM/PCS are developed and kept up to date by the Centers for Medicare & Medicaid Services, and you’ll find these mapping tools on CMS.gov. These resources, like the General Equivalence Mappings (GEMs), are specifically created to translate codes across ICD revisions and are used widely in CMS programs and reporting. The ICD-10-CM Codebook, while essential for understanding code descriptions and usage, does not provide the official crosswalks. Coding Clinic offers coding guidance from the American Hospital Association, not the official mappings. Project Guidelines aren’t standardized sources for these mappings. So the correct place to locate the official mapping tools is CMS.gov.