ICD-10 Code H71.23 – Cholesteatoma of mastoid, bilateral (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H71.23 – Cholesteatoma of mastoid, bilateral
What it is
H71.23 identifies cholesteatoma involving both mastoid regions. This means abnormal skin-like growth is present in the mastoid area on each side, usually associated with chronic ear disease.
Clinical signs
Typical findings include chronic ear drainage, hearing loss, and evidence of destructive middle ear or mastoid disease on exam or imaging. Clinical features vary; refer to documentation.
When to use this code
Use H71.23 when the record clearly documents cholesteatoma in both mastoids, or bilateral mastoid involvement is stated by the clinician. Code it from operative, imaging, or specialist notes when laterality is explicit. If the note only says cholesteatoma without location, check documentation.
Do not use for
Do not use this code for unilateral mastoid cholesteatoma, middle ear cholesteatoma without mastoid involvement, or suspected disease not confirmed in the record. Check documentation for laterality and anatomic site.
Coding tip
Confirm both the mastoid site and bilateral laterality before assigning H71.23.