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ICD-10-CM · FY 2026 APRIL UPDATE

R94

Abnormal results of function studies

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
R94.0Abnormal results of function studies of central nervous systemCategory
R94.01Abnormal electroencephalogram [EEG]Billable
R94.02Abnormal brain scanBillable
R94.09Abnormal results of other function studies of central nervous systemBillable
R94.1Abnormal results of function studies of peripheral nervous system and special sensesCategory
R94.11Abnormal results of function studies of eyeCategory
R94.110Abnormal electro-oculogram [EOG]Billable
R94.111Abnormal electroretinogram [ERG]Billable
R94.112Abnormal visually evoked potential [VEP]Billable
R94.113Abnormal oculomotor studyBillable
R94.118Abnormal results of other function studies of eyeBillable
R94.12Abnormal results of function studies of ear and other special sensesCategory
R94.120Abnormal auditory function studyBillable
R94.121Abnormal vestibular function studyBillable
R94.128Abnormal results of other function studies of ear and other special sensesBillable
R94.13Abnormal results of function studies of peripheral nervous systemCategory
R94.130Abnormal response to nerve stimulation, unspecifiedBillable
R94.131Abnormal electromyogram [EMG]Billable
R94.138Abnormal results of other function studies of peripheral nervous systemBillable
R94.2Abnormal results of pulmonary function studiesBillable
R94.3Abnormal results of cardiovascular function studiesCategory
R94.30Abnormal result of cardiovascular function study, unspecifiedBillable
R94.31Abnormal electrocardiogram [ECG] [EKG]Billable
R94.39Abnormal result of other cardiovascular function studyBillable
R94.4Abnormal results of kidney function studiesBillable
R94.5Abnormal results of liver function studiesBillable
R94.6Abnormal results of thyroid function studiesBillable
R94.7Abnormal results of other endocrine function studiesBillable
R94.8Abnormal results of function studies of other organs and systemsBillable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.