ICD-10 Code H80.00 – Otosclerosis involving oval window, nonobliterative, unspecified ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H80.00 – Otosclerosis involving oval window, nonobliterative, unspecified ear
What it is
This code identifies otosclerosis affecting the oval window with a nonobliterative pattern in an unspecified ear. It describes abnormal bone remodeling around the stapes that can reduce sound transmission.
Clinical signs
Typical findings include progressive conductive hearing loss, often with a normal tympanic membrane on exam. Tinnitus or a family history of otosclerosis may be present; clinical features vary, so refer to documentation.
When to use this code
Use this code when the record specifically documents otosclerosis involving the oval window and states the process is nonobliterative. Choose it when the affected ear is not identified or is documented as unspecified. If the note only says hearing loss or otosclerosis without these details, check documentation.
Do not use for
Do not use this code for obliterative otosclerosis, because that requires a different code. Do not assign it when the chart does not confirm oval window involvement or when another ear-specific code is documented.
Coding tip
Verify both the anatomic site and the nonobliterative wording before coding, and query the provider if the ear laterality is missing.