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	—
R94.01	Abnormal electroencephalogram [EEG]	✓
R94.1	Abnormal results of function studies of peripheral nervous system and special senses	—
R94.02	Abnormal brain scan	✓
R94.2	Abnormal results of pulmonary function studies	✓
R94.3	Abnormal results of cardiovascular function studies	—
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	✓
R94.09	Abnormal results of other function studies of central nervous system	✓
R94.11	Abnormal results of function studies of eye	—
R94.12	Abnormal results of function studies of ear and other special senses	—
R94.13	Abnormal results of function studies of peripheral nervous system	—
R94.30	Abnormal result of cardiovascular function study, unspecified	✓
R94.31	Abnormal electrocardiogram [ECG] [EKG]	✓
R94.39	Abnormal result of other cardiovascular function study	✓
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	✓

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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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