ICD-9-CM diagnosis code (retired)
204.12 — Chronic lymphoid leukemia, in relapse
ICD-9-CM was replaced by ICD-10 on October 1, 2015. These are the ICD-10-CM equivalents from the CMS General Equivalence Mappings.
About ICD-9-CM 204.12
204.12 is an ICD-9-CM diagnosis code for chronic lymphoid leukemia, in relapse. ICD-9-CM was retired for U.S. claims on October 1, 2015, when ICD-10-CM took over.
The CMS General Equivalence Mappings translate it to one ICD-10-CM code, C91.12 (Chronic lymphocytic leukemia of B-cell type in relapse). The match is exact.
ICD-10-CM equivalents
- C91.12Chronic lymphocytic leukemia of B-cell type in relapseexact match
Common questions about 204.12
What is the ICD-10 code for ICD-9 204.12?
- The GEMs map 204.12 to ICD-10-CM C91.12.
GEMs are a translation aid, not a substitute for coding from the record. The 2027 ICD-10 code set has changed since the last GEMs release in 2018. Page updated September 29, 2026.