U.S. ICD-10-CM · FY 2027

K12 ICD-10-CM Code: Stomatitis and related lesions

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

K12

Stomatitis and related lesions

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where K12 sits

  1. 1

    Chapter 11

    Diseases of the digestive system (K00-K95)

  2. 2

    Section

    Diseases of oral cavity and salivary glands (K00-K14)

  3. 3

    Category K12

    Stomatitis and related lesions

  4. 4

    Code K12

    Stomatitis and related lesions

More specific choices

Codes under K12

K12 is a non-billable category. Choose the child code that best matches the documented diagnosis.

K12.0

Recurrent oral aphthae

K12.1

Other forms of stomatitis

K12.2

Cellulitis and abscess of mouth

K12.3

Oral mucositis (ulcerative)

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for K12.

Code first

No “code first” instruction is listed for K12.

Use additional code

  • 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)

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for K12.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code K12 mean?

K12 is the FY 2027 U.S. ICD-10-CM code for “Stomatitis and related lesions.”

Is K12 a billable or specific ICD-10-CM code?

No. K12 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is K12 located in ICD-10-CM?

K12 is listed in Chapter 11, Diseases of the digestive system (K00-K95), within Diseases of oral cavity and salivary glands (K00-K14) (K00–K14), under category K12, Stomatitis and related lesions.

What coding notes are listed for K12?

No inclusion terms are listed for K12 in this reference record. No code-first instruction is listed. Additional-code instructions: 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). Excludes1 notes: cancrum oris (A69.0); cheilitis (K13.0); gangrenous stomatitis (A69.0); herpesviral [herpes simplex] gingivostomatitis (B00.2); noma (A69.0). No Excludes2 note is listed.

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