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ICD-10-CM category R94: Abnormal results of function studies

Category R94 is a heading in chapter 18 (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)), section Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94). It is not billable; report one of the 23 complete codes below.

Notes that apply to every R94 code

Includes
  • abnormal results of radionuclide [radioisotope] uptake studies
  • abnormal results of scintigraphy

Billable codes in R94

Billable FY2027 ICD-10-CM codes in category R94
CodeDescription
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

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Codes from the FY2027 ICD-10-CM files (all chapters). Report the code that matches the documentation and the Official Guidelines; this list is not coding advice.