ICD-9-CM diagnosis code (retired)
528.4 — Cysts of oral soft tissues
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 528.4
528.4 is an ICD-9-CM diagnosis code for cysts of oral soft tissues. 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, K09.8 (Other cysts of oral region, not elsewhere classified). The match is approximate, so confirm it against the record.
ICD-10-CM equivalents
- K09.8Other cysts of oral region, not elsewhere classifiedapproximate
Common questions about 528.4
What is the ICD-10 code for ICD-9 528.4?
- The GEMs map 528.4 to ICD-10-CM K09.8.
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.