ICD-10 Code H80.1 – Otosclerosis involving oval window, obliterative (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H80.1 – Otosclerosis involving oval window, obliterative
What it is
H80.1 identifies obliterative otosclerosis affecting the oval window, a form of abnormal bone remodeling in the middle ear. It can restrict stapes movement and contribute to conductive hearing loss.
Clinical signs
Typical findings include progressive hearing loss, often with reduced air conduction on audiology. Clinical features vary; refer to documentation for confirmation of oval window involvement and obliterative changes.
When to use this code
Use H80.1 when the provider documents obliterative otosclerosis with oval window involvement. It is appropriate when the record clearly distinguishes this subtype from other otosclerosis forms. Check documentation if the note only says “otosclerosis” or “hearing loss.”
Do not use for
Do not use this code for nonspecific conductive hearing loss without documented otosclerosis. It is also wrong for other ear disorders or when the obliterative oval window subtype is not stated.
Coding tip
Code H80.1 only when the documentation names both otosclerosis and obliterative oval window involvement.