ICD-9-CM diagnosis code (retired)
550.91 — Inguinal hernia, without mention of obstruction or gangrene, unilateral or unspecified, recurrent
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 550.91
550.91 is an ICD-9-CM diagnosis code for inguinal hernia, without mention of obstruction or gangrene, unilateral or unspecified, recurrent. 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, K40.91 (Unilateral inguinal hernia, without obstruction or gangrene, recurrent). The match is exact.
ICD-10-CM equivalents
- K40.91Unilateral inguinal hernia, without obstruction or gangrene, recurrentexact match
Common questions about 550.91
What is the ICD-10 code for ICD-9 550.91?
- The GEMs map 550.91 to ICD-10-CM K40.91.
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.