ICD-9-CM diagnosis code (retired)
556.6 — Universal 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 556.6
556.6 is an ICD-9-CM diagnosis code for Universal 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, K51.00 (Ulcerative (chronic) pancolitis without complications). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- K51.00Ulcerative (chronic) pancolitis without complicationsapproximate
Common questions about 556.6
What is the ICD-10 code for ICD-9 556.6?
- The GEMs map 556.6 to ICD-10-CM K51.00.
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.