ICD-10 Code H80.10 – Otosclerosis involving oval window, obliterative, unspecified ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H80.10 – Otosclerosis involving oval window, obliterative, unspecified ear
What it is
This code identifies otosclerosis affecting the oval window with obliterative fixation, when the ear is not specified. It describes abnormal bone remodeling that can limit stapes movement and impair sound transmission.
Clinical signs
Typical findings include progressive conductive hearing loss and reduced hearing clarity, often with a normal tympanic membrane. Clinical features vary; refer to documentation.
When to use this code
Use H80.10 when the provider documents otosclerosis involving the oval window, with obliterative change, and does not specify right or left ear. Apply it when the record supports a diagnosis of otosclerosis rather than a nonspecific hearing loss complaint. Check documentation if laterality is stated elsewhere.
Do not use for
Do not use this code for otosclerosis with a specified ear, or for hearing loss without documented otosclerosis. If the note describes another middle ear disorder, code that condition instead.
Coding tip
Confirm both the otosclerosis type and laterality in the provider note before assigning H80.10.