| R94.11 | Abnormal results of function studies of eye | NON-BILLABLE CODE |
| R94.110 | Abnormal electro-oculogram [EOG] | BILLABLE CODE |
| R94.111 | Abnormal electroretinogram [ERG] | BILLABLE CODE |
| R94.112 | Abnormal visually evoked potential [VEP] | BILLABLE CODE |
| R94.113 | Abnormal oculomotor study | BILLABLE CODE |
| R94.118 | Abnormal results of other function studies of eye | BILLABLE CODE |
| R94.12 | Abnormal results of function studies of ear and other special senses | NON-BILLABLE CODE |
| R94.120 | Abnormal auditory function study | BILLABLE CODE |
| R94.121 | Abnormal vestibular function study | BILLABLE CODE |
| R94.128 | Abnormal results of other function studies of ear and other special senses | BILLABLE CODE |
| R94.13 | Abnormal results of function studies of peripheral nervous system | NON-BILLABLE CODE |
| R94.130 | Abnormal response to nerve stimulation, unspecified | BILLABLE CODE |
| R94.131 | Abnormal electromyogram [EMG] | BILLABLE CODE |
| R94.138 | Abnormal results of other function studies of peripheral nervous system | BILLABLE CODE |
