ICD-9-CM diagnosis code (retired)
540.0 — Acute appendicitis with generalized peritonitis
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 540.0
540.0 is an ICD-9-CM diagnosis code for acute appendicitis with generalized peritonitis. 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, K35.2 (Acute appendicitis with generalized peritonitis). The match is exact.
ICD-10-CM equivalents
- K35.2Acute appendicitis with generalized peritonitisexact match
Common questions about 540.0
What is the ICD-10 code for ICD-9 540.0?
- The GEMs map 540.0 to ICD-10-CM K35.2.
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.