I.B.20

Multiple Sites Coding

The classification defines “multiple” as involving two or more sites. Follow chapter- specific guidelines for assigning codes for “multiple sites.” In the absence of chapter- specific guidelines, assign codes describing specified sites individually when documented. When the specified site(s) are not documented, assign the appropriate code for “multiple sites.”

ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026 (effective October 1, 2025). Published by CMS and NCHS. Reproduced for reference — always verify against the official CMS release.