ICD-9-CM diagnosis code (retired)
528.09 — Other stomatitis and mucositis (ulcerative)
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 528.09
528.09 is an ICD-9-CM diagnosis code for other stomatitis and mucositis (ulcerative). 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 K12.1 (Other forms of stomatitis) and K12.39 (Other oral mucositis (ulcerative)). All of these are approximate matches, so review the record to pick the right one.
ICD-10-CM equivalents
Common questions about 528.09
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.