ICD-10-CM > H60-H95 > H90-H94 > H91 > H91.2 H91.2 Sudden idiopathic hearing loss Non-Billable/Non-Specific Applicable To Sudden hearing loss NOS Codes H91.20Sudden idiopathic hearing loss, unspecified earH91.21Sudden idiopathic hearing loss, right earH91.22Sudden idiopathic hearing loss, left earH91.23Sudden idiopathic hearing loss, bilateral