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 2026, 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the R94 range.
Congenital Abnormalities
Malformations of organs or body parts during development in utero.
Teratogenesis
The formation of CONGENITAL ABNORMALITIES.
About the R94 Code Range
The ICD-10 code section R94 covers abnormal results of function studies, primarily identifying unexpected or unusual findings from diagnostic tests across various body systems without specifying a definitive disease. These codes help document abnormal diagnostic study outcomes when no confirmed diagnosis is yet established.
This section includes codes like R94.01 for abnormal electroencephalograms (EEG), which encompass terms such as reduction of alpha activity and rhythmic discharges, aiding medical coders in linking abnormal EEG findings to the correct code. Abnormal brain scans are coded as R94.02, while other abnormal central nervous system function tests fall under R94.09, including auditory or cerebral evoked potentials. Eye function abnormalities, like abnormal electroretinograms (ERG) and electro-oculograms (EOG), use codes such as R94.110 and R94.111. Abnormal results in pulmonary, cardiovascular, kidney, liver, thyroid, and endocrine function studies are also included with codes ranging from R94.2 to R94.7. Proper use of these codes ensures precise identification of abnormal study results, assisting both healthcare providers and coders in medical record accuracy and patient management.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
