R94.01 Abnormal electroencephalogram [EEG]

Billable ICD-10-CM code, FY2026.

Applies from R94 Abnormal results of function studies

Includes

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

MS-DRG index

Defines the logic of DRG(s) 091-093 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 794.02 Nonspecific abnormal electroencephalogram [EEG]

Code annotations containing back-references to R94.01

Back-references to R94

• Type 1 Excludes: T88.7 Unspecified adverse effect of drug or medicament ("specified adverse effects of drugs and medicaments (A00-R94 and T80-T88.6, T88.8)")

Diagnosis Index entries for R94.01

• Abnormal, abnormality, abnormalities › electroencephalogram [EEG]

Nearby codes

• R94 Abnormal results of function studies
• R94.0 Abnormal results of function studies of central nervous system
• R94.01 Abnormal electroencephalogram [EEG] (this code)
• 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 senses
• R94.11 Abnormal results of function studies of eye
• R94.110 Abnormal electro-oculogram [EOG]