K12.3Oral mucositis (ulcerative)

K12.3 is the ICD-10-CM diagnosis code for oral mucositis (ulcerative). It belongs to category K12 (stomatitis and related lesions), block K00-K14 (diseases of oral cavity and salivary glands) and chapter 11 (diseases of the digestive system). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

Within K12 (stomatitis and related lesions), K12.3 is specifically for oral mucositis (ulcerative). Related codes cover recurrent oral aphthae (K12.0), other forms of stomatitis (K12.1) and cellulitis and abscess of mouth (K12.2).

To report this condition, pick the subcode that matches the documentation: K12.30 (unspecified), K12.31 (due to antineoplastic therapy), K12.32 (due to other drugs), K12.33 (due to radiation) and K12.39 ((ulcerative)).

The conditions in its Excludes2 note aren't part of K12.3, but may be coded alongside it if the patient has both: gastrointestinal mucositis (ulcerative) (K92.81), mucositis (ulcerative) of vagina and vulva (N76.81) and nasal mucositis (ulcerative) (J34.81).

Use an additional code to identify: alcohol abuse and dependence (F10.-), exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31) and 2 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.