ICD-9-CM diagnosis code (retired)
100.81 — Leptospiral meningitis (aseptic)
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 100.81
100.81 is an ICD-9-CM diagnosis code for leptospiral meningitis (aseptic). 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, A27.81 (Aseptic meningitis in leptospirosis). The match is exact.
ICD-10-CM equivalents
- A27.81Aseptic meningitis in leptospirosisexact match
Common questions about 100.81
What is the ICD-10 code for ICD-9 100.81?
- The GEMs map 100.81 to ICD-10-CM A27.81.
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.