ICD-9-CM diagnosis code (retired)
521.00 — Dental caries, 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 521.00
521.00 is an ICD-9-CM diagnosis code for dental caries, 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, K02.9 (Dental caries, unspecified). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- K02.9Dental caries, unspecifiedapproximate
Common questions about 521.00
What is the ICD-10 code for ICD-9 521.00?
- The GEMs map 521.00 to ICD-10-CM K02.9.
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.