R94: Abnormal results of function studies
Codes under R94 (Abnormal results of function studies). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| R94.0 | Abnormal results of function studies of central nervous system | — |
| R94.0 | Abnormal results of function studies of central nervous system | — |
| R94.01 | Abnormal electroencephalogram [EEG] | ✓ |
| R94.01 | Abnormal electroencephalogram [EEG] | ✓ |
| R94.1 | Abnormal results of function studies of peripheral nervous system and special senses | — |
| R94.1 | Abnormal results of function studies of peripheral nervous system and special senses | — |
| R94.02 | Abnormal brain scan | ✓ |
| R94.02 | Abnormal brain scan | ✓ |
| R94.2 | Abnormal results of pulmonary function studies | ✓ |
| R94.2 | Abnormal results of pulmonary function studies | ✓ |
| R94.3 | Abnormal results of cardiovascular function studies | — |
| R94.3 | Abnormal results of cardiovascular function studies | — |
| R94.4 | Abnormal results of kidney function studies | ✓ |
| R94.4 | Abnormal results of kidney function studies | ✓ |
| R94.5 | Abnormal results of liver function studies | ✓ |
| R94.5 | Abnormal results of liver function studies | ✓ |
| R94.6 | Abnormal results of thyroid function studies | ✓ |
| R94.6 | Abnormal results of thyroid function studies | ✓ |
| R94.7 | Abnormal results of other endocrine function studies | ✓ |
| R94.7 | Abnormal results of other endocrine function studies | ✓ |
| R94.8 | Abnormal results of function studies of other organs and systems | ✓ |
| R94.8 | Abnormal results of function studies of other organs and systems | ✓ |
| R94.09 | Abnormal results of other function studies of central nervous system | ✓ |
| R94.09 | Abnormal results of other function studies of central nervous system | ✓ |
| R94.11 | Abnormal results of function studies of eye | — |
| R94.11 | Abnormal results of function studies of eye | — |
| R94.12 | Abnormal results of function studies of ear and other special senses | — |
| R94.12 | Abnormal results of function studies of ear and other special senses | — |
| R94.13 | Abnormal results of function studies of peripheral nervous system | — |
| R94.13 | Abnormal results of function studies of peripheral nervous system | — |
| R94.30 | Abnormal result of cardiovascular function study, unspecified | ✓ |
| R94.30 | Abnormal result of cardiovascular function study, unspecified | ✓ |
| R94.31 | Abnormal electrocardiogram [ECG] [EKG] | ✓ |
| R94.31 | Abnormal electrocardiogram [ECG] [EKG] | ✓ |
| R94.39 | Abnormal result of other cardiovascular function study | ✓ |
| R94.39 | Abnormal result of other cardiovascular function study | ✓ |
| R94.110 | Abnormal electro-oculogram [EOG] | ✓ |
| R94.110 | Abnormal electro-oculogram [EOG] | ✓ |
| R94.111 | Abnormal electroretinogram [ERG] | ✓ |
| R94.111 | Abnormal electroretinogram [ERG] | ✓ |
| R94.112 | Abnormal visually evoked potential [VEP] | ✓ |
| R94.112 | Abnormal visually evoked potential [VEP] | ✓ |
| R94.113 | Abnormal oculomotor study | ✓ |
| R94.113 | Abnormal oculomotor study | ✓ |
| R94.118 | Abnormal results of other function studies of eye | ✓ |
| R94.118 | Abnormal results of other function studies of eye | ✓ |
| R94.120 | Abnormal auditory function study | ✓ |
| R94.120 | Abnormal auditory function study | ✓ |
| R94.121 | Abnormal vestibular function study | ✓ |
| R94.121 | Abnormal vestibular function study | ✓ |
| R94.128 | Abnormal results of other function studies of ear and other special senses | ✓ |
| R94.128 | Abnormal results of other function studies of ear and other special senses | ✓ |
| R94.130 | Abnormal response to nerve stimulation, unspecified | ✓ |
| R94.130 | Abnormal response to nerve stimulation, unspecified | ✓ |
| R94.131 | Abnormal electromyogram [EMG] | ✓ |
| R94.131 | Abnormal electromyogram [EMG] | ✓ |
| R94.138 | Abnormal results of other function studies of peripheral nervous system | ✓ |
| R94.138 | Abnormal results of other function studies of peripheral nervous system | ✓ |
Frequently asked questions
What is ICD-10-CM code R94?
R94 is an ICD-10-CM category covering Abnormal results of function studies. It contains 58 more specific diagnosis codes, 46 of which are billable.
Is R94 a billable code?
No — R94 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example R94.0 — Abnormal results of function studies of central nervous system). 46 of the 58 codes under R94 are billable.
What codes fall under R94?
R94 includes R94.0, R94.0, R94.01, R94.01, R94.1, plus 53 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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