ICD-9-CM diagnosis code (retired)
555.1 — Regional enteritis of large intestine
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 555.1
555.1 is an ICD-9-CM diagnosis code for regional enteritis of large intestine. 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, K50.10 (Crohn's disease of large intestine without complications). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- K50.10Crohn's disease of large intestine without complicationsapproximate
Common questions about 555.1
What is the ICD-10 code for ICD-9 555.1?
- The GEMs map 555.1 to ICD-10-CM K50.10.
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.