ICD-10 Code H80.02 – Otosclerosis involving oval window, nonobliterative, left ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H80.02 – Otosclerosis involving oval window, nonobliterative, left ear
What it is
This code identifies otosclerosis affecting the oval window in the left ear, with the stapes footplate not fully fixed. It usually describes a conductive hearing problem caused by abnormal bone remodeling in the middle ear.
Clinical signs
Typical findings include progressive hearing loss, often conductive, and reduced sound transmission on exam or audiology testing. Clinical features vary; refer to documentation.
When to use this code
Use H80.02 when the provider documents left-sided otosclerosis involving the oval window and specifies the nonobliterative form. You should also use it when operative, audiology, or specialist notes clearly support this exact diagnosis. Check documentation if laterality or subtype is unclear.
Do not use for
Do not use this code for otosclerosis in the right ear, bilateral disease, or obliterative otosclerosis. Do not assign it when the record only states hearing loss without confirming otosclerosis.
Coding tip
Confirm both laterality and the nonobliterative subtype before coding, because these details determine the correct H80 family code.