| ICD-10 Code | Description |
| R94.01 | Abnormal electroencephalogram [EEG] |
| R94.02 | Abnormal brain scan |
| R94.09 | Abnormal results of other function studies of central nervous system |
| R94.110 | Abnormal electro-oculogram [EOG] |
| R94.111 | Abnormal electroretinogram [ERG] |
| R94.112 | Abnormal visually evoked potential [VEP] |
| R94.113 | Abnormal oculomotor study |
| R94.118 | Abnormal results of other function studies of eye |
| R94.120 | Abnormal auditory function study |
| R94.121 | Abnormal vestibular function study |
| R94.128 | Abnormal results of other function studies of ear and other special senses |
| R94.130 | Abnormal response to nerve stimulation, unspecified |
| R94.131 | Abnormal electromyogram [EMG] |
| R94.138 | Abnormal results of other function studies of peripheral nervous system |
| R94.2 | Abnormal results of pulmonary function studies |
| R94.30 | Abnormal result of cardiovascular function study, unspecified |
| R94.31 | Abnormal electrocardiogram [ECG] [EKG] |
| R94.39 | Abnormal result of other cardiovascular function study |
| R94.4 | Abnormal results of kidney function studies |
| R94.5 | Abnormal results of liver function studies |
| R94.6 | Abnormal results of thyroid function studies |
| R94.7 | Abnormal results of other endocrine function studies |
| R94.8 | Abnormal results of function studies of other organs and systems |
