ICD-10 Code H95.132 – Mucosal cyst of postmastoidectomy cavity, left ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H95.132 – Mucosal cyst of postmastoidectomy cavity, left ear
What it is
This code identifies a mucosal cyst located in the postmastoidectomy cavity of the left ear. It refers to a postoperative ear cavity finding after mastoid surgery.
Clinical signs
Clinical features vary; refer to documentation. Typical charting may note a cystic lesion in the mastoid cavity, persistent cavity changes, or otologic symptoms linked to prior surgery.
When to use this code
Use H95.132 when the record specifically documents a mucosal cyst in the left postmastoidectomy cavity. Code it from the operative history or follow-up note when the condition is described as a postoperative cavity complication.
Do not assign it for general ear cysts or nonspecific mastoid abnormalities. If the side or exact postoperative site is not documented, check documentation before coding.
Do not use for
Do not use this code for a cyst in the right ear, an unspecified ear, or a non-mucosal lesion. It is also not for routine mastoidectomy follow-up without a documented cyst.
Coding tip
Verify both the postoperative cavity and laterality; H95.132 is only for the left ear.