ICD-10 Code H80.21 – Cochlear otosclerosis, right ear (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H80.21 – Cochlear otosclerosis, right ear
What it is
Cochlear otosclerosis is a form of otosclerosis that affects the cochlea and inner ear structures. In this code, the condition is specifically documented in the right ear.
Clinical signs
Typical findings include progressive hearing loss and, in some cases, tinnitus. Clinical features vary; refer to documentation for laterality and whether the cochlear involvement is confirmed.
When to use this code
Use H80.21 when the record clearly states cochlear otosclerosis affecting the right ear. Apply it for provider-documented diagnoses in outpatient, inpatient, or specialist notes. If the chart only says otosclerosis without laterality or cochlear detail, check documentation before coding.
Do not use for
Do not use this code for unspecified otosclerosis, left ear disease, or bilateral involvement. Do not assign it when the diagnosis is not documented or when the note only suggests hearing loss without confirmed otosclerosis.
Coding tip
Verify both the cochlear subtype and right-ear laterality before assigning H80.21.