ICD-10 Code K13.4 – Granuloma and granuloma-like lesions of oral mucosa (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K13.4 – Granuloma and granuloma-like lesions of oral mucosa
What it is
K13.4 identifies granuloma and granuloma-like lesions affecting the oral mucosa. Use it for a documented oral soft-tissue lesion described as granulomatous or granuloma-like, not for a specific named oral disease unless that diagnosis is confirmed.
Clinical signs
Clinical features vary; refer to documentation. Records may describe a localized oral mucosal mass, nodular lesion, or chronic inflammatory-appearing growth, often noted on the lips, cheeks, tongue, or gingiva.
When to use this code
Use K13.4 when the provider documents a granuloma or granuloma-like lesion of the oral mucosa and no more specific diagnosis is established. It also fits when the lesion is identified clinically or histologically as an oral mucosal granulomatous lesion. If another condition explains the finding, code that condition instead.
Do not use for
Do not use this code for non-oral skin granulomas, periodontal disease, or a clearly named oral lesion with its own code. Check documentation when the chart only says “oral lesion” or “mouth mass.”
Coding tip
Code the documented oral mucosal diagnosis exactly as stated, and query if the note does not clearly distinguish granuloma from another oral lesion.