ICD-10 Code H74.31 – Ankylosis of ear ossicles (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H74.31 – Ankylosis of ear ossicles
What it is
Ankylosis of the ear ossicles means the tiny middle-ear bones are fixed together or cannot move normally. This limits sound transmission and can cause conductive hearing loss.
Clinical signs
Common findings include reduced hearing, especially conductive hearing loss on exam or audiology. Clinical features vary; refer to documentation, and confirm the ossicular fixation when recorded.
When to use this code
Use this code when the provider documents ankylosis or fixation of the ossicles, including the malleus, incus, or stapes, as the cause of hearing loss. It also applies when the diagnosis is confirmed during otologic evaluation or surgery. Check documentation if the note only says “hearing loss” without a stated ossicular cause.
Do not use for
Do not use it for nonspecific hearing loss, otitis media, or other middle-ear disorders unless ossicular ankylosis is documented. Do not assume fixation from abnormal hearing tests alone.
Coding tip
Code H74.31 only when the record clearly identifies ossicular ankylosis or fixation as the diagnosis.