Chapter 28: Extension Codes

ICD-11 to ICD-10 crosswalk mappings for codes XA0000-XY96

44 ICD-11 codes in this chapter have ICD-10 crosswalk mappings from the WHO.

Extension codes are used as supplementary codes to provide additional detail about diagnosis codes. They include severity, temporality, aetiology, anatomy, and other qualifiers. Extension codes cannot be used as standalone codes.