ICD-9-CM diagnosis code (retired)
716.66 — Unspecified monoarthritis, lower leg
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 716.66
716.66 is an ICD-9-CM diagnosis code for unspecified monoarthritis, lower leg. 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, M13.169 (Monoarthritis, not elsewhere classified, unspecified knee). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- M13.169Monoarthritis, not elsewhere classified, unspecified kneeapproximate
Common questions about 716.66
What is the ICD-10 code for ICD-9 716.66?
- The GEMs map 716.66 to ICD-10-CM M13.169.
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.