| H91.0 | Ototoxic hearing loss | NON-BILLABLE CODE |
| H91.01 | Ototoxic hearing loss, right ear | BILLABLE CODE |
| H91.02 | Ototoxic hearing loss, left ear | BILLABLE CODE |
| H91.03 | Ototoxic hearing loss, bilateral | BILLABLE CODE |
| H91.09 | Ototoxic hearing loss, unspecified ear | BILLABLE CODE |
| H91.1 | Presbycusis | NON-BILLABLE CODE |
| H91.10 | Presbycusis, unspecified ear | BILLABLE CODE |
| H91.11 | Presbycusis, right ear | BILLABLE CODE |
| H91.12 | Presbycusis, left ear | BILLABLE CODE |
| H91.13 | Presbycusis, bilateral | BILLABLE CODE |
| H91.2 | Sudden idiopathic hearing loss | NON-BILLABLE CODE |
| H91.20 | Sudden idiopathic hearing loss, unspecified ear | BILLABLE CODE |
| H91.21 | Sudden idiopathic hearing loss, right ear | BILLABLE CODE |
| H91.22 | Sudden idiopathic hearing loss, left ear | BILLABLE CODE |
| H91.23 | Sudden idiopathic hearing loss, bilateral | BILLABLE CODE |
| H91.3 | Deaf nonspeaking, not elsewhere classified | BILLABLE CODE |
| H91.8 | Other specified hearing loss | NON-BILLABLE CODE |
| H91.8X | Other specified hearing loss | NON-BILLABLE CODE |
| H91.8X1 | Other specified hearing loss, right ear | BILLABLE CODE |
| H91.8X2 | Other specified hearing loss, left ear | BILLABLE CODE |
| H91.8X3 | Other specified hearing loss, bilateral | BILLABLE CODE |
| H91.8X9 | Other specified hearing loss, unspecified ear | BILLABLE CODE |
| H91.9 | Unspecified hearing loss | NON-BILLABLE CODE |
| H91.90 | Unspecified hearing loss, unspecified ear | BILLABLE CODE |
| H91.91 | Unspecified hearing loss, right ear | BILLABLE CODE |
| H91.92 | Unspecified hearing loss, left ear | BILLABLE CODE |
| H91.93 | Unspecified hearing loss, bilateral | BILLABLE CODE |
