DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

K12 Stomatitis and related lesions

  • Header · not billable

K12 is not billable. The category heads 8 billable codes in FY2027, grouped under 4 subdivisions.

Index → code

  • Canker (mouth) (sore) → K12.0
  • Mucositis (ulcerative) → K12.30
  • Ludwig's angina or disease → K12.2

Where it sits

  1. Chapter 11 Diseases of the digestive system (K00-K95)
  2. K00-K14 Diseases of oral cavity and salivary glands (K00-K14)
  3. K12 Stomatitis and related lesions
Billable codes
8
Subdivisions
4
CC / MCC codes
1 / 0
HCC V28 codes
0
New FY2027
0
Index entries
60

Codes in K12

  1. K12.0
    Recurrent oral aphthae
    Billable
    Inclusion terms 5

    Inclusion terms

    • Aphthous stomatitis (major) (minor)
    • Bednar's aphthae
    • Periadenitis mucosa necrotica recurrens
    • Recurrent aphthous ulcer
    • Stomatitis herpetiformis
  2. K12.1
    Other forms of stomatitis
    Billable
    Inclusion terms 4, Excludes1 2

    Inclusion terms

    • Stomatitis NOS
    • Denture stomatitis
    • Ulcerative stomatitis
    • Vesicular stomatitis

    Excludes1

    • acute necrotizing ulcerative stomatitis (A69.1) A69.1
    • Vincent's stomatitis (A69.1) A69.1
  3. K12.2
    Cellulitis and abscess of mouth
    BillableCC
    Inclusion terms 2, Excludes2 5

    Inclusion terms

    • Cellulitis of mouth (floor)
    • Submandibular abscess

    Excludes2

    • abscess of salivary gland (K11.3) K11.3
    • abscess of tongue (K14.0) K14.0
    • periapical abscess (K04.6-K04.7) K04.6 K04.7
    • periodontal abscess (K05.21) K05.21
    • peritonsillar abscess (J36) J36
  4. K12.3
    Oral mucositis (ulcerative)
    Header
    Inclusion terms 1, Excludes2 3

    Inclusion terms

    • Mucositis (oral) (oropharyneal)

    Excludes2

    • gastrointestinal mucositis (ulcerative) (K92.81) K92.81
    • mucositis (ulcerative) of vagina and vulva (N76.81) N76.81
    • nasal mucositis (ulcerative) (J34.81) J34.81
  5. K12.30
    Oral mucositis (ulcerative), unspecified
    Billable
  6. K12.31
    Oral mucositis (ulcerative) due to antineoplastic therapy
    Billable
    Use additional code 3

    Use additional code

    • code for adverse effect, if applicable, to identify antineoplastic and immunosuppressive drugs (T45.1X5) T45.1X5
    • code for other antineoplastic therapy, such as:
    • radiological procedure and radiotherapy (Y84.2) Y84.2
  7. K12.32
    Oral mucositis (ulcerative) due to other drugs
    Billable
    Use additional code 1

    Use additional code

    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) T36 T50
  8. K12.33
    Oral mucositis (ulcerative) due to radiation
    Billable
    Use additional code 1

    Use additional code

    • external cause code (W88-W90, X39.0-) to identify cause W88 W90 X39.0
  9. K12.39
    Other oral mucositis (ulcerative)
    Billable
    Inclusion terms 1

    Inclusion terms

    • Viral oral mucositis (ulcerative)

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At K12

Excludes1

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

Use additional code

  • code to identify:
  • alcohol abuse and dependence (F10.-) F10
  • exposure to environmental tobacco smoke (Z77.22) Z77.22
  • exposure to tobacco smoke in the perinatal period (P96.81) P96.81
  • history of tobacco dependence (Z87.891) Z87.891
  • occupational exposure to environmental tobacco smoke (Z57.31) Z57.31
  • tobacco dependence (F17.-) F17
  • tobacco use (Z72.0) Z72.0

Notes that also apply

Chapter 11 instructions (Excludes2 8): printed on the chapter 11 page.

Index entries

  • Canker (mouth) (sore) → K12.0
  • Periadenitis mucosa necrotica recurrens → K12.0
  • Stomatitis (denture) (ulcerative) → K12.1
  • Ludwig's angina or disease → K12.2
  • Staphylitis (acute) (catarrhal) (chronic) (gangrenous) (membranous) (suppurative) (ulcerative) → K12.2
  • Uvulitis (acute) (catarrhal) (chronic) (membranous) (suppurative) (ulcerative) → K12.2
  • Mucositis (ulcerative) → K12.30
  • Aphthae, aphthousBednar's → K12.0
  • Aphthae, aphthousoral (recurrent) → K12.0
  • Aphthae, aphthousstomatitis (major) (minor) → K12.0
  • Aphthae, aphthousulcer (oral) (recurrent) → K12.0
  • Bednar'saphthae → K12.0
  • Stomatitis (denture) (ulcerative)aphthous → K12.0
  • Stomatitis (denture) (ulcerative)herpetiformis → K12.0
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeaphthous (oral) (recurrent) → K12.0
  • Catarrh, catarrhal (acute) (febrile) (infectious) (inflammation)mouth → K12.1
  • Inflammation, inflamed, inflammatory (with exudation)mouth → K12.1
  • Stomatitis (denture) (ulcerative)catarrhal → K12.1
  • Stomatitis (denture) (ulcerative)follicular → K12.1
  • Stomatitis (denture) (ulcerative)malignant → K12.1
  • Stomatitis (denture) (ulcerative)membranous acute → K12.1
  • Stomatitis (denture) (ulcerative)septic → K12.1
  • Stomatitis (denture) (ulcerative)vesicular → K12.1
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativebuccal (cavity) (traumatic) → K12.1
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativeoral mucosa (traumatic) → K12.1
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativepalate (soft) → K12.1
  • Ulcer, ulcerated, ulcerating, ulceration, ulcerativestomatitis → K12.1
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)buccal cavity → K12.2
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)mouth (floor) → K12.2
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)palate (soft) → K12.2
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)sublingual → K12.2
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)submandibular (region) (space) (triangle) → K12.2
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)uvula → K12.2
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)Ludovici → K12.2
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)Ludwig's → K12.2
  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative)mouth (floor) → K12.2
  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative)palate (soft) → K12.2
  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative)submandibular (region) (space) (triangle) → K12.2
  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative)submaxillary (region) → K12.2
  • Disease, diseasedLudwig's (submaxillary cellulitis) → K12.2

20 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy