ICD-10 Code K13.6 – Irritative hyperplasia of oral mucosa (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K13.6 – Irritative hyperplasia of oral mucosa
What it is
K13.6 identifies irritative hyperplasia of the oral mucosa, a benign overgrowth of mouth tissue caused by chronic local irritation. Use it when the record documents reactive mucosal thickening rather than a neoplasm.
Clinical signs
Typical findings include a localized, persistent, raised or thickened oral lesion at the site of repeated trauma. Clinical features vary; refer to documentation.
When to use this code
Use K13.6 when the provider documents irritative hyperplasia, traumatic hyperplasia, or a similar reactive oral mucosal enlargement. It fits cases linked to friction from dentures, teeth, or other chronic irritation. Confirm the note supports a benign, nonmalignant process.
Do not use for
Do not use this code for oral cancers, premalignant lesions, or ulcers without hyperplastic change. Check documentation if the lesion is described differently or the cause is unclear.
Coding tip
Code the documented diagnosis, and capture the irritation source only if the record clearly identifies it.