ICD-9-CM diagnosis code (retired)
066.1 — Tick-borne fever
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 066.1
066.1 is an ICD-9-CM diagnosis code for tick-borne fever. 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, A93.2 (Colorado tick fever). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- A93.2Colorado tick feverapproximate
Common questions about 066.1
What is the ICD-10 code for ICD-9 066.1?
- The GEMs map 066.1 to ICD-10-CM A93.2.
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.