ICD-10 Code H80.0 – Otosclerosis involving oval window, nonobliterative (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H80.0 – Otosclerosis involving oval window, nonobliterative
What it is
H80.0 identifies otosclerosis affecting the oval window without complete fixation. It describes abnormal bone remodeling in the middle ear that can limit sound transmission.
Clinical signs
Typical findings include progressive conductive hearing loss and reduced hearing on audiology testing. Tinnitus may occur; clinical features vary, so refer to documentation.
When to use this code
Use H80.0 when the provider documents otosclerosis involving the oval window and specifies that it is nonobliterative. This is appropriate when the diagnosis is supported by otologic evaluation, hearing testing, or operative findings. Code only when the record clearly distinguishes it from other otosclerosis types.
Do not use for
Do not use this code if the chart does not specify nonobliterative oval window involvement. Check documentation for other causes of hearing loss or for obliterative otosclerosis.
Coding tip
Verify the exact otosclerosis subtype in the assessment or operative note before assigning H80.0.