ICD-9-CM diagnosis code (retired)
787.91 — Diarrhea
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 787.91
787.91 is an ICD-9-CM diagnosis code for diarrhea. 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 3 ICD-10-CM codes, such as K52.29 (Other allergic and dietetic gastroenteritis and colitis), K52.89 (Other specified noninfective gastroenteritis and colitis) and R19.7 (Diarrhea, unspecified). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 787.91
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.