ICD-10-CM category
R94 Abnormal results of function studies
R94 is a category, not a billable code. Report one of the 23 complete codes below.
Codes in R94
- R94.01Abnormal electroencephalogram [EEG]
- R94.02Abnormal brain scan
- R94.09Abnormal results of other function studies of central nervous system
- R94.110Abnormal electro-oculogram [EOG]
- R94.111Abnormal electroretinogram [ERG]
- R94.112Abnormal visually evoked potential [VEP]
- R94.113Abnormal oculomotor study
- R94.118Abnormal results of other function studies of eye
- R94.120Abnormal auditory function study
- R94.121Abnormal vestibular function study
- R94.128Abnormal results of other function studies of ear and other special senses
- R94.130Abnormal response to nerve stimulation, unspecified
- R94.131Abnormal electromyogram [EMG]
- R94.138Abnormal results of other function studies of peripheral nervous system
- R94.2Abnormal results of pulmonary function studies
- R94.30Abnormal result of cardiovascular function study, unspecified
- R94.31Abnormal electrocardiogram [ECG] [EKG]
- R94.39Abnormal result of other cardiovascular function study
- R94.4Abnormal results of kidney function studies
- R94.5Abnormal results of liver function studies
- R94.6Abnormal results of thyroid function studies
- R94.7Abnormal results of other endocrine function studies
- R94.8Abnormal results of function studies of other organs and systems
Outside the US? R94 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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