ICD-10 Code K13.1 – Cheek and lip biting (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K13.1 – Cheek and lip biting
What it is
K13.1 identifies habitual or repetitive biting of the cheek or lip. Use it when the record documents this oral self-injury as the condition being addressed.
Clinical signs
Findings may include visible trauma, soreness, ulceration, or thickened tissue on the inner cheek or lip. Clinical features vary; refer to documentation.
When to use this code
Use K13.1 when the provider documents cheek or lip biting as a diagnosis, problem, or reason for evaluation. It may appear in dental, oral medicine, or primary care notes. Code it only when the behavior is clearly described and clinically relevant.
Do not use for
Do not use this code for accidental oral trauma, general mouth pain, or nonspecific oral ulcers without biting documented. Check documentation if the note does not clearly identify cheek or lip biting.
Coding tip
Code the condition only when the chart links the oral injury to cheek or lip biting, not when biting is merely suspected.