Other diseases of lip and oral mucosa (K13) ICD-10-CM
The K13 code range covers other diseases of lip and oral mucosa with 16 ICD-10-CM diagnosis codes. 13 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- epithelial disturbances of tongue
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an 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
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the K13 Range 16 codes · 13 billable
- K13 Other diseases of lip and oral mucosaNon-billable
- K13.0 Diseases of lips
- K13.1 Cheek and lip biting
- K13.2 Leukoplakia and other disturbances of oral epithelium, including tongueNon-billable
- K13.21 Leukoplakia of oral mucosa, including tongue
- K13.22 Minimal keratinized residual ridge mucosa
- K13.23 Excessive keratinized residual ridge mucosa
- K13.24 Leukokeratosis nicotina palati
- K13.29 Other disturbances of oral epithelium, including tongue
- K13.3 Hairy leukoplakia
- K13.4 Granuloma and granuloma-like lesions of oral mucosa
- K13.5 Oral submucous fibrosis
- K13.6 Irritative hyperplasia of oral mucosa
- K13.7 Other and unspecified lesions of oral mucosaNon-billable
- K13.70 Unspecified lesions of oral mucosa
- K13.79 Other lesions of oral mucosa
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the K13 range.
Cheilitis
Inflammation of the lips. It is of various etiologies and degrees of pathology.
Leukoplakia, Hairy
Epithelial hyperplasia of the oral mucosa associated with Epstein-Barr virus (HERPESVIRUS 4, HUMAN) and found almost exclusively in persons with HIV infection. The lesion consists of a white patch that is often corrugated or hairy.
Oral Leukoplakia
A white patch or plaque on the oral mucosa that cannot be characterized clinically or pathologically as any other disease. The diagnosis of leukoplakia is one of exclusion; other conditions such as candidiasis, lichen planus, leukoedema, etc., must be ruled out before a diagnosis of leukoplakia can be made. Leukoplakia may be a premalignant condition.
Oral Submucous Fibrosis
Irreversible FIBROSIS of the submucosal tissue of the MOUTH.
About the K13 Code Range
These conditions affect the lips and the lining of the mouth, including the tongue. They include cheek or lip biting, changes in mouth tissue, and lesions of the mouth lining.
K13.0 groups diseases of the lips, while K13.1 identifies cheek and lip biting. K13.2 groups leukoplakia and other changes to the mouth’s surface lining. Its subdivisions distinguish leukoplakia, changes in residual ridge tissue, a named palate condition, and other surface changes.
Separate categories identify hairy leukoplakia, granuloma-like lesions, fibrosis beneath the mouth lining, and irritative tissue overgrowth. K13.7 separates other lesions of the mouth lining from unspecified lesions.
Questions About This Page
How many billable codes are in the K13 range?
Of the 16 codes in this range, 13 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the K13 range classify?
The range classifies other diseases of lip and oral mucosa. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
