ICD-10 Code H90.A1 – Conductive hearing loss, unilateral, with restricted hearing on the contralateral side (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H90.A1 – Conductive hearing loss, unilateral, with restricted hearing on the contralateral side
What it is
This code identifies conductive hearing loss affecting one ear, with reduced hearing in the opposite ear as well. Use it when documentation specifies unilateral conductive loss and some restriction of hearing on the contralateral side.
Clinical signs
Typical findings include diminished air-conduction hearing on one side and evidence of hearing limitation in the other ear. Clinical features vary; refer to documentation.
When to use this code
Use H90.A1 when the provider clearly documents unilateral conductive hearing loss with restricted hearing in the opposite ear. It may appear in audiology, ENT, or problem-list documentation when both ears are affected, but one ear is the primary conductive loss.
Do not use for
Do not use this code if the record describes sensorineural or mixed hearing loss, or if bilateral conductive loss is documented instead. Check documentation when the laterality or type of loss is unclear.
Coding tip
Confirm both laterality and hearing type in the note before assigning H90.A1.