2026 ICD-10-CM Diagnosis Code K13Other diseases of lip and oral mucosa

ICD-10-CM Codes›K00–K95›K00-K14›K13

ICD-10-CM K13
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K13 is a non-billable ICD-10-CM category code for other diseases of lip and oral mucosa, so it cannot be submitted on claims. Use a more specific code from this category instead, such as K13.0, K13.1, K13.21, and K13.22.

Code Identity

ICD-10-CM Code
K13
Billable Status
No — Non-Billable Category
Code Describes
Other diseases of lip and oral mucosa
Chapter
K00-K14
Diseases of oral cavity and salivary glands

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK13Other diseases of lip and oral mucosa
This CodeK13Other diseases of lip and oral mucosa

Specific Coding for Other diseases of lip and oral mucosaOverview

Non-specific codes like K13 require more characters. Use one of these billable codes instead:

  • Use K13.0 for Diseases of lips

  • Use K13.1 for Cheek and lip biting

  • K13.2 for Leukoplakia and other disturbances of oral epithelium, including tongue

  • Use K13.21 for Leukoplakia of oral mucosa, including tongue

  • Use K13.22 for Minimal keratinized residual ridge mucosa

  • Use K13.23 for Excessive keratinized residual ridge mucosa

  • Use K13.24 for Leukokeratosis nicotina palati

  • Use K13.29 for Other disturbances of oral epithelium, including tongue

  • Use K13.3 for Hairy leukoplakia

  • Use K13.4 for Granuloma and granuloma-like lesions of oral mucosa

  • Use K13.5 for Oral submucous fibrosis

  • Use K13.6 for Irritative hyperplasia of oral mucosa

  • K13.7 for Other and unspecified lesions of oral mucosa

  • Use K13.70 for Unspecified lesions of oral mucosa

  • Use K13.79 for Other lesions of oral mucosa

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • epithelial disturbances of tongue

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

Type 2 Excludes

  • certain disorders of gingiva and edentulous alveolar ridge K05 K06
  • cysts of oral region K09
  • diseases of tongue K14
  • stomatitis and related lesions K12

Patient EducationClinical

Mouth Disorders

Your mouth is one of the most important parts of your body. It has many different functions. It allows you to:

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Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K13Overview

Is K13 (Other diseases of lip and oral mucosa) a billable code?

No. This is a category header that groups the codes for other diseases of lip and oral mucosa, and headers cannot be submitted on claims. Claims for other diseases of lip and oral mucosa need a more specific code from this category, such as K13.0, K13.1, and K13.21.