ICD-9-CM diagnosis code (retired)
100.9 — Leptospirosis, unspecified
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 100.9
100.9 is an ICD-9-CM diagnosis code for leptospirosis, unspecified. 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, A27.9 (Leptospirosis, unspecified). The match is exact.
ICD-10-CM equivalents
- A27.9Leptospirosis, unspecifiedexact match
Common questions about 100.9
What is the ICD-10 code for ICD-9 100.9?
- The GEMs map 100.9 to ICD-10-CM A27.9.
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.