ICD-10 Code H71.22 – Cholesteatoma of mastoid, left ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H71.22 – Cholesteatoma of mastoid, left ear
What it is
H71.22 identifies a cholesteatoma located in the mastoid of the left ear. It is an abnormal growth of skin-like tissue in the middle ear or mastoid area that can erode nearby structures.
Clinical signs
Typical findings include chronic ear drainage, hearing loss, and a history of recurrent ear disease. Clinical features vary; refer to documentation, especially when imaging or otoscopic findings confirm mastoid involvement.
When to use this code
Use this code when the provider documents cholesteatoma specifically in the left mastoid. It may also apply when imaging, surgery, or specialist notes clearly identify the left-sided mastoid site. If the record only says “cholesteatoma” without location, check documentation.
Do not use for
Do not use H71.22 for cholesteatoma in another ear site or for an unspecified ear side. Do not assign it when the chart describes only middle ear disease without confirmed mastoid involvement.
Coding tip
Confirm both laterality and anatomic site in the operative note, imaging report, or assessment before assigning H71.22.