ICD-10 Code K13.23 – Excessive keratinized residual ridge mucosa (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K13.23 – Excessive keratinized residual ridge mucosa
What it is
K13.23 identifies an oral mucosal condition where the residual ridge has an unusually thick or excessive keratinized surface. It is used when the finding is documented as a specific soft tissue change of the edentulous ridge.
Clinical signs
Clinical features vary; refer to documentation. Typical descriptions may note a firm, keratinized ridge mucosa on exam, often recorded by a dental or oral specialist as an abnormal mucosal finding.
When to use this code
Use K13.23 when the provider specifically documents excessive keratinized residual ridge mucosa as the diagnosis or principal oral finding. You may also use it when the chart clearly describes this residual ridge change without a broader alternative diagnosis.
If the note only mentions nonspecific oral irritation, denture discomfort, or ridge anatomy without this exact condition, check documentation before assigning the code.
Do not use for
Do not use this code for general oral lesions, gingival disease, or denture problems without documentation of excessive keratinized residual ridge mucosa. Check documentation if the finding is described differently.
Coding tip
Assign the code only when the provider names the residual ridge mucosal change explicitly; otherwise, query for clarification.