ICD-10 Code H90.A21 – Sensorineural hearing loss, unilateral, right ear, with restricted hearing on the contralateral side (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H90.A21 – Sensorineural hearing loss, unilateral, right ear, with restricted hearing on the contralateral side
What it is
This code identifies sensorineural hearing loss affecting the right ear, with reduced hearing in the left ear that is not normal but is less severe. Use it when documentation specifies this asymmetric pattern.
Clinical signs
Patients may report difficulty hearing speech, especially in noise, and may favor one ear. Audiology typically shows unilateral sensorineural loss on the right with restricted hearing in the opposite ear; clinical features vary, refer to documentation.
When to use this code
Use this code when the record clearly states right-sided sensorineural hearing loss and notes contralateral hearing is restricted rather than normal. It fits audiology, ENT, or problem-list documentation that matches this exact laterality and severity pattern. If the chart only says bilateral hearing loss or does not define the left ear, check documentation.
Do not use for
Do not use it for conductive or mixed hearing loss, or for unspecified unilateral hearing loss. Do not assign it when the opposite ear is documented as normal or when laterality is not clear.
Coding tip
Confirm both ear findings in the audiology report or provider note before coding.