ICD-10 Code H71.20 – Cholesteatoma of mastoid, unspecified ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H71.20 – Cholesteatoma of mastoid, unspecified ear
What it is
H71.20 identifies a cholesteatoma located in the mastoid, with the ear side not specified. It refers to an abnormal growth of keratinizing epithelium in the temporal bone region.
Clinical signs
Common findings include chronic ear drainage, hearing loss, and evidence of destructive middle ear or mastoid disease. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record documents cholesteatoma of the mastoid but does not identify right or left ear. It is appropriate for confirmed diagnoses from otologic examination, imaging, or operative findings. Code the documented laterality if the record specifies it.
Do not use for
Do not use it for cholesteatoma in another ear site, such as the middle ear or attic, unless the mastoid is specifically documented. Check documentation if the laterality or anatomic site is unclear.
Coding tip
Verify that the provider names the mastoid and that no laterality is documented before assigning H71.20.