ICD-10-CM K12: Stomatitis and related lesions

ICD-10-CM Diagnosis Code (2025)

Official Description for K12

Stomatitis and related lesions

Coding Notes & Guidelines for K12

Excludes1: Not Coded Here
  • cancrum oris (A69.0)
  • cheilitis (K13.0)
  • gangrenous stomatitis (A69.0)
  • herpesviral [herpes simplex] gingivostomatitis (B00.2)
  • noma (A69.0)
Excludes1: Not Coded Here
  • acute necrotizing ulcerative stomatitis (A69.1)
  • Vincent's stomatitis (A69.1)
Excludes2: Not Included Here
  • abscess of salivary gland (K11.3)
  • abscess of tongue (K14.0)
  • periapical abscess (K04.6-K04.7)
  • periodontal abscess (K05.21)
  • peritonsillar abscess (J36)
Excludes2: Not Included Here
  • gastrointestinal mucositis (ulcerative) (K92.81)
  • mucositis (ulcerative) of vagina and vulva (N76.81)
  • nasal mucositis (ulcerative) (J34.81)
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)
Use Additional Code

code for adverse effect, if applicable, to identify antineoplastic and immunosuppressive drugs (T45.1X5)

Use Additional Code
  • code for other antineoplastic therapy, such as:
  • radiological procedure and radiotherapy (Y84.2)
Use Additional Code

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Use Additional Code

external cause code (W88-W90, X39.0-) to identify cause

Inclusion Terms
  • Aphthous stomatitis (major) (minor)
  • Bednar's aphthae
  • Periadenitis mucosa necrotica recurrens
  • Recurrent aphthous ulcer
  • Stomatitis herpetiformis
Inclusion Terms
  • Stomatitis NOS
  • Denture stomatitis
  • Ulcerative stomatitis
  • Vesicular stomatitis
Inclusion Terms
  • Cellulitis of mouth (floor)
  • Submandibular abscess
Inclusion Terms

Mucositis (oral) (oropharyneal)

Inclusion Terms

Viral oral mucositis (ulcerative)

Child Codes (More Specific Codes for K12):

K12.0 - Recurrent oral aphthae K12.1 - Other forms of stomatitis K12.2 - Cellulitis and abscess of mouth K12.3 - Oral mucositis (ulcerative) K12.30 - Oral mucositis (ulcerative), unspecified K12.31 - Oral mucositis (ulcerative) due to antineoplastic therapy K12.32 - Oral mucositis (ulcerative) due to other drugs K12.33 - Oral mucositis (ulcerative) due to radiation K12.39 - Other oral mucositis (ulcerative)

About ICD-10-CM Code K12 (Stomatitis and related lesions)

ICD-10-CM code K12 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM K12 became effective on October 1, 2024.

This page provides detailed information about K12 - Stomatitis and related lesions. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Stomatitis and related lesions.