Abnormal results of function studies (R94) ICD-10-CM
The R94 code range covers abnormal results of function studies with 30 ICD-10-CM diagnosis codes. 23 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- abnormal results of radionuclide [radioisotope] uptake studies
- abnormal results of scintigraphy
Codes in the R94 Range 30 codes · 23 billable
- R94 Abnormal results of function studiesNon-billable
- R94.0 Abnormal results of function studies of central nervous systemNon-billable
- R94.01 Abnormal electroencephalogram [EEG]
- R94.02 Abnormal brain scan
- R94.09 Abnormal results of other function studies of central nervous system
- R94.1 Abnormal results of function studies of peripheral nervous system and special sensesNon-billable
- R94.11 Abnormal results of function studies of eyeNon-billable
- 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
- R94.12 Abnormal results of function studies of ear and other special sensesNon-billable
- 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
- R94.13 Abnormal results of function studies of peripheral nervous systemNon-billable
- 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
- R94.3 Abnormal results of cardiovascular function studiesNon-billable
- 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
About the R94 Code Range
These codes describe abnormal results from tests of how the body functions, without a diagnosis. The results can involve the nervous system, senses, lungs, heart, kidneys, liver, thyroid, or other organs.
The subdivisions separate results by the system studied. R94.0 includes EEG results, brain scans, and other central nervous system studies. R94.1 separates eye studies, ear and other sense studies, and peripheral nerve studies. More detailed codes distinguish specific eye tests, hearing and balance studies, and nerve stimulation or EMG results.
Other subdivisions cover lung, kidney, liver, thyroid, other endocrine, and other organ function studies. R94.3 separates ECG results from other cardiovascular function studies.
Questions About This Page
How many billable codes are in the R94 range?
Of the 30 codes in this range, 23 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the R94 range classify?
The range classifies abnormal results of function studies. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
