1. K12 Stomatitis and related lesions

    Use 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)
    tobacco dependence (F17.-)
    tobacco use (Z72.0)


    • cancrum oris (A69.0)
    • cheilitis (K13.0)
    • gangrenous stomatitis (A69.0)
    • herpesviral [herpes simplex] gingivostomatitis (B00.2)
    • noma (A69.0)
    1. K12.0 Recurrent oral aphthae

      Inclusion term(s):

      • Aphthous stomatitis (major) (minor)
      • Bednar's aphthae
      • Periadenitis mucosa necrotica recurrens
      • Recurrent aphthous ulcer
      • Stomatitis herpetiformis
    2. K12.1 Other forms of stomatitis

      Inclusion term(s):

      • Stomatitis NOS
      • Denture stomatitis
      • Ulcerative stomatitis
      • Vesicular stomatitis
    3. K12.2 Cellulitis and abscess of mouth

      Inclusion term(s):

      • Cellulitis of mouth (floor)
      • Submandibular abscess
    4. K12.3 Oral mucositis (ulcerative)

      Inclusion term(s):

      • Mucositis (oral) (oropharyneal)
      1. K12.30 Oral mucositis (ulcerative), unspecified

      2. K12.31 Oral mucositis (ulcerative) due to antineoplastic therapy

      3. K12.32 Oral mucositis (ulcerative) due to other drugs

      4. K12.33 Oral mucositis (ulcerative) due to radiation

      5. K12.39 Other oral mucositis (ulcerative)

        Inclusion term(s):

        • Viral oral mucositis (ulcerative)
Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.