ICD-10 Code H90.42 – Sensorineural hearing loss, unilateral, left ear, with unrestricted hearing on the contralateral side (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H90.42 – Sensorineural hearing loss, unilateral, left ear, with unrestricted hearing on the contralateral side
What it is
This code identifies sensorineural hearing loss affecting the left ear only, while hearing in the opposite ear remains unrestricted. It reflects inner ear or auditory nerve dysfunction rather than a conductive problem.
Clinical signs
You may see decreased hearing on the left, difficulty understanding speech, or asymmetric hearing test results. Clinical features vary; refer to documentation.
When to use this code
Use H90.42 when the record clearly documents unilateral sensorineural hearing loss in the left ear and normal or unrestricted hearing in the right ear. It is appropriate when audiology or provider notes support the laterality and type of loss. Check documentation if the chart does not specify sensorineural versus conductive loss.
Do not use for
Do not use this code for bilateral hearing loss, unspecified hearing loss, or conductive hearing loss. If the side, type, or contralateral hearing status is unclear, check documentation.
Coding tip
Confirm both laterality and hearing status of the opposite ear before assigning H90.42.