ICD-9-CM diagnosis code (retired)
528.9 — Other and unspecified diseases of the 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 528.9
528.9 is an ICD-9-CM diagnosis code for other and unspecified diseases of the 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 2 ICD-10-CM codes, such as K13.70 (Unspecified lesions of oral mucosa) and K13.79 (Other lesions of oral mucosa). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 528.9
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.