K13
ICD-10Non-billable categoryOther diseases of lip and oral mucosa
Official ICD-10-CM descriptor (FY2026)
Other diseases of lip and oral mucosa
K13 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Includes
- epithelial disturbances of tongue
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- certain disorders of gingiva and edentulous alveolar ridge (K05-K06)
- cysts of oral region (K09.-)
- diseases of tongue (K14.-)
- stomatitis and related lesions (K12.-)
Use additional code
Report an additional code to identify the associated condition.
- 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)
More specific codes under K13
- K13.0Diseases of lips
- K13.1Cheek and lip biting
- K13.2Leukoplakia and oth disturb of oral epithelium, inc tonguecategory
- K13.3Hairy leukoplakia
- K13.4Granuloma and granuloma-like lesions of oral mucosa
- K13.5Oral submucous fibrosis
- K13.6Irritative hyperplasia of oral mucosa
- K13.7Other and unspecified lesions of oral mucosacategory
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.