ICD-9-CM diagnosis code (retired)
556.5 — Left-sided ulcerative (chronic) colitis
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 556.5
556.5 is an ICD-9-CM diagnosis code for Left-sided ulcerative (chronic) colitis. 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, K51.50 (Left sided colitis without complications). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- K51.50Left sided colitis without complicationsapproximate
Common questions about 556.5
What is the ICD-10 code for ICD-9 556.5?
- The GEMs map 556.5 to ICD-10-CM K51.50.
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.