ICD-10-CM > K00-K95 > K00-K14 > K12 > K12.3 K12.3 Oral mucositis (ulcerative) Non-Billable/Non-Specific Applicable To Mucositis (oral) (oropharyneal) Type 2 Excludes gastrointestinal mucositis (ulcerative) (K92.81)mucositis (ulcerative) of vagina and vulva (N76.81)nasal mucositis (ulcerative) (J34.81) Codes K12.30Oral mucositis (ulcerative), unspecifiedK12.31Oral mucositis (ulcerative) due to antineoplastic therapyK12.32Oral mucositis (ulcerative) due to other drugsK12.33Oral mucositis (ulcerative) due to radiationK12.39Other oral mucositis (ulcerative)