ICD-10 Code K13.7 – Other and unspecified lesions of oral mucosa (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K13.7 – Other and unspecified lesions of oral mucosa
What it is
K13.7 identifies a nonspecific lesion affecting the oral mucosa. Use it when documentation describes an oral mucosal abnormality, but does not name a more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a visible lesion, patch, plaque, ulcer, or other mucosal change in the mouth without a more specific identified cause.
When to use this code
Use K13.7 when the provider documents an oral mucosal lesion and gives no clearer diagnosis. It also fits “unspecified” oral mucosal changes when the record does not support a more exact code. Code the documented site and condition as written.
Do not use for
Do not use this code when the lesion is diagnosed as a specific disorder, such as leukoplakia, stomatitis, or a malignant oral lesion. Check documentation if the record names a more precise oral condition.
Coding tip
Before assigning K13.7, look for a documented specific oral diagnosis; unspecified coding is appropriate only when the provider has not clarified the lesion.