R94.01
BillableAbnormal electroencephalogram [EEG]
Abnormal electroencephalogram [EEG]
Coding Notes
Includes
Conditions included under this code
- nonspecific abnormal findings on diagnostic imaging by computerized axial tomography [CAT scan]
- nonspecific abnormal findings on diagnostic imaging by magnetic resonance imaging [MRI][NMR]
- nonspecific abnormal findings on diagnostic imaging by positron emission tomography [PET scan]
- nonspecific abnormal findings on diagnostic imaging by thermography
- nonspecific abnormal findings on diagnostic imaging by ultrasound [echogram]
- nonspecific abnormal findings on diagnostic imaging by X-ray examination
- abnormal results of radionuclide [radioisotope] uptake studies
- abnormal results of scintigraphy
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
- •abnormal findings on antenatal screening of motherO28
- diagnostic abnormal findings classified elsewhere - see Alphabetical Index
Excludes 2
Conditions not included here, but the patient may have both
- •abnormal findings on antenatal screening of motherO28
- •certain conditions originating in the perinatal periodP04-P96
- signs and symptoms classified in the body system chapters
- •signs and symptoms of breast,N63, N64.5
Related Codes(2)
Also Known As / Clinical Terms(314)
SNOMED CT
- Cerebral death by EEG13500002
- Electrocerebral silence13500002
- Flat EEG13500002
- Respirator brain death13500002
- EEG abnormality without seizure18259008
- Electroencephalogram abnormality without seizure18259008
- Light-induced EEG abnormality41716002
- Light-induced electroencephalogram abnormality41716002
- EEG abnormality with seizure43400009
- Electroencephalogram abnormality with seizure43400009
- Sound-induced EEG abnormality66806007
- Sound-induced electroencephalogram abnormality66806007
- EEG artefact251442008
- EEG artifact251442008
- Electroencephalogram artefact251442008
- Electroencephalogram artifact251442008
- EEG artefact - patient movement251443003
- EEG artifact - patient movement251443003
- Electroencephalogram artefact - patient movement251443003
- Electroencephalogram artifact - patient movement251443003
- EEG artefact - technical problems251444009
- EEG artifact - technical problems251444009
- Electroencephalogram artefact - technical problems251444009
- Electroencephalogram artifact - technical problems251444009
- Dominant alpha activity251446006
- Dominant beta activity251447002
- Dominant theta activity251448007
- Dominant delta activity251449004
- EEG pattern of uncertain significance251450004
- Electroencephalogram pattern of uncertain significance251450004
- Positive spikes (including 14 and 6 per second)251451000
- Low amplitude 6/s spike wave251452007
- Low amplitude six per second spike wave251452007
- Small sharp transients during sleep251453002
- SREDA - Subclinical rhythmical EEG discharges in adults251454008
- Subclinical rhythmical EEG discharges in adults251454008
- Subclinical rhythmical electroencephalogram discharges in adults251454008
- RMTD - Rhythmic mid-temporal discharge251455009
- Rhythmic mid-temporal discharge251455009
- Asymmetrical mu activity251456005
- Trace alternant EEG pattern251457001
- Trace alternant electroencephalogram pattern251457001
- Generalised continuous EEG abnormality251458006
- Generalised continuous electroencephalogram abnormality251458006
- Generalised non-paroxysmal EEG abnormality251458006
- Generalized continuous EEG abnormality251458006
- Generalized continuous electroencephalogram abnormality251458006
- Generalized non-paroxysmal EEG abnormality251458006
- Low frequency background activity251459003
- Low frequency alpha activity251460008
- Low frequency theta activity251461007
- Low frequency delta activity251462000
- Periodic complexes251463005
- Continuous periodic complexes251464004
- Intermittent periodic complexes251465003
- Triphasic waves251466002
- Alpha coma type recording251467006
- Beta coma type recording251468001
- Burst suppression251469009
- Loss of reactivity251470005
- Low amplitude EEG tracing251471009
- Low amplitude electroencephalogram tracing251471009
- Isoelectric recording251472002
- Generalised episodic EEG abnormality251473007
- Generalised episodic electroencephalogram abnormality251473007
- Generalised paroxysmal EEG abnormality251473007
- Generalized episodic EEG abnormality251473007
- Generalized episodic electroencephalogram abnormality251473007
- Generalized paroxysmal EEG abnormality251473007
- Generalised epileptiform discharges251474001
- Generalized epileptiform discharges251474001
- Generalised 3/s spike wave251475000
- Generalised three per second spike wave251475000
- Generalized 3/s spike wave251475000
- Generalized three per second spike wave251475000
- Generalised slow spike wave (less than three per second)251476004
- Generalized slow spike wave (less than three per second)251476004
- Generalised atypical spike wave251477008
- Generalized atypical spike wave251477008
- Generalised multifocal spikes251478003
- Generalized multifocal spikes251478003
- BIPLEDS - Bilateral periodic epileptiform discharges251479006
- Bilateral periodic epileptiform discharges251479006
- Generalised intermittent theta activity251480009
- Generalized intermittent theta activity251480009
- Generalised intermittent delta activity251481008
- Generalized intermittent delta activity251481008
- Excessive overbreathing response251482001
- Prolonged overbreathing response251483006
- Focal continuous EEG abnormality251485004
- Focal continuous electroencephalogram abnormality251485004
- Focal continuous theta activity251486003
- Focal continuous delta activity251487007
- Focal sharp waves251488002
- Focal spikes251489005
- Focal rolandic spikes251491002
- PLEDS - Periodic lateralised epileptiform discharges251492009
- PLEDS - Periodic lateralized epileptiform discharges251492009
- Periodic lateralised epileptiform discharges251492009
- Periodic lateralized epileptiform discharges251492009
- Focal reduction of EEG activity251493004
- Focal reduction of electroencephalogram activity251493004
- Focal episodic EEG abnormality251495006
- Focal episodic electroencephalogram abnormality251495006
- Focal episodic theta activity251496007
- Focal episodic delta activity251497003
- FIRDA - Frontal intermittent rhythmic delta activity251499000
- Frontal intermittent rhythmic delta activity251499000
- OIRDA - intermittent rhythmic delta activity251500009
- Occipital intermittent rhythmic delta activity251500009
- Focal episodic sharp waves251501008
- Focal episodic spikes251502001
- Focal episodic spike wave251503006
- Focal episodic spike wave with secondary generalisation251505004
- Focal episodic spike wave with secondary generalization251505004
- Focal recruiting discharge251506003
- Asymmetric EEG251508002
- Asymmetric electroencephalogram251508002
- Alpha amplitude asymmetry251509005
- Alpha frequency asymmetry251510000
- Generalised EEG amplitude asymmetry251511001
- Generalised electroencephalogram amplitude asymmetry251511001
- Generalized EEG amplitude asymmetry251511001
- Generalized electroencephalogram amplitude asymmetry251511001
- Generalised EEG frequency asymmetry251512008
- Generalised electroencephalogram frequency asymmetry251512008
- Generalized EEG frequency asymmetry251512008
- Generalized electroencephalogram frequency asymmetry251512008
- Asymmetric beta activity251513003
- EEG abnormal274521009
- Electroencephalogram abnormal274521009
- Finding of generalised electroencephalogram pattern364852004
- Finding of generalized electroencephalogram pattern364852004
- Generalised EEG pattern - finding364852004
- Generalized EEG pattern - finding364852004
- Dominant EEG frequency - finding364863001
- Finding of dominant electroencephalogram frequency364863001
- EEG symmetry - finding364885007
- Finding of electroencephalogram symmetry364885007
- Cafe-au-lait macules with temporal dysrhythmia403821004
- Café-au-lait macules with temporal dysrhythmia403821004
- Temporal slowing417621006
- Reduction of alpha activity in left cerebral hemisphere1119388009
- Reduction of alpha activity in right cerebral hemisphere1119389001
UMLS
- Abnormal EEGC0151611
- Abnormal ElectroencephalogramC0151611
- Abnormal electroencephalogramC0151611
- Abnormal electroencephalogram [EEG]C0151611
- Disorder EEG (NOS)C0151611
- EEG abnormalC0151611
- EEG abnormalitiesC0151611
- EEG abnormalityC0151611
- Electroencephalogram (EEG) abnormalitiesC0151611
- Electroencephalogram abnormalC0151611
- Electroencephalogram abnormal (finding)C0151611
- Electroencephalogram abnormalitiesC0151611
- abnormal eegC0151611
- abnormality eegC0151611
- eeg abnormalC0151611
- eeg abnormalityC0151611
- electroencephalogram abnormalC0151611
Clinical Terms
- PLEDS - Periodic lateralised epileptiform discharges
- Café-au-lait macules with temporal dysrhythmia
- Dominant EEG frequency - finding
- Focal spikes
- FIRDA - Frontal intermittent rhythmic delta activity
- Low frequency alpha activity
- Light-induced electroencephalogram abnormality
- electroencephalogram abnormal
- Dominant theta activity
- Asymmetric electroencephalogram
- Electroencephalogram abnormal (finding)
- Low frequency background activity
- Generalised paroxysmal EEG abnormality
- Rhythmic mid-temporal discharge
- Focal episodic sharp waves
- Periodic lateralised epileptiform discharges
- Alpha amplitude asymmetry
- EEG abnormalities
- Low frequency theta activity
- Temporal slowing
- Sound-induced electroencephalogram abnormality
- Asymmetric EEG
- SREDA - Subclinical rhythmical EEG discharges in adults
- Generalised three per second spike wave
- Intermittent periodic complexes
- RMTD - Rhythmic mid-temporal discharge
- Focal episodic spike wave with secondary generalisation
- Loss of reactivity
- Generalized atypical spike wave
- Flat EEG
- Asymmetrical mu activity
- EEG pattern of uncertain significance
- Generalized EEG frequency asymmetry
- Focal rolandic spikes
- EEG artifact
- Generalised episodic electroencephalogram abnormality
- Generalized EEG pattern - finding
- Small sharp transients during sleep
- EEG abnormal
- Focal episodic EEG abnormality
- Generalised intermittent delta activity
- Generalized continuous electroencephalogram abnormality
- Sound-induced EEG abnormality
- Generalized episodic electroencephalogram abnormality
- Cafe-au-lait macules with temporal dysrhythmia
- Generalised episodic EEG abnormality
- Light-induced EEG abnormality
- Frontal intermittent rhythmic delta activity
- Trace alternant EEG pattern
- Triphasic waves
- Low amplitude six per second spike wave
- Focal continuous theta activity
- Excessive overbreathing response
- Reduction of alpha activity in right cerebral hemisphere
- Electroencephalogram abnormalities
- Electroencephalogram artefact - patient movement
- Generalised slow spike wave (less than three per second)
- Focal episodic spike wave
- Focal continuous EEG abnormality
- Generalised EEG amplitude asymmetry
- Abnormal Electroencephalogram
- Dominant delta activity
- Dominant alpha activity
- Electrocerebral silence
- Electroencephalogram artefact
- Periodic lateralized epileptiform discharges
- Generalized three per second spike wave
- Occipital intermittent rhythmic delta activity
- Electroencephalogram artefact - technical problems
- Focal reduction of EEG activity
- Generalised intermittent theta activity
- Focal sharp waves
- Cerebral death by EEG
- Focal episodic electroencephalogram abnormality
- Low amplitude electroencephalogram tracing
- Focal continuous delta activity
- Generalised electroencephalogram frequency asymmetry
- Asymmetric beta activity
- Generalized epileptiform discharges
- Focal episodic spike wave with secondary generalization
- EEG artefact - technical problems
- Finding of generalised electroencephalogram pattern
- PLEDS - Periodic lateralized epileptiform discharges
- Electroencephalogram artifact - patient movement
- Generalised continuous electroencephalogram abnormality
- Burst suppression
- Generalised 3/s spike wave
- Alpha frequency asymmetry
- Low amplitude 6/s spike wave
- Finding of dominant electroencephalogram frequency
- Finding of electroencephalogram symmetry
- EEG abnormality with seizure
- OIRDA - intermittent rhythmic delta activity
- EEG artifact - technical problems
- BIPLEDS - Bilateral periodic epileptiform discharges
- Disorder EEG (NOS)
- Generalized continuous EEG abnormality
- abnormality eeg
- EEG artefact
- Generalised non-paroxysmal EEG abnormality
- Generalised atypical spike wave
- Continuous periodic complexes
- Finding of generalized electroencephalogram pattern
- Electroencephalogram artifact - technical problems
- Respirator brain death
- Low frequency delta activity
- Trace alternant electroencephalogram pattern
- Dominant beta activity
- Generalized EEG amplitude asymmetry
- Generalised multifocal spikes
- Generalized 3/s spike wave
- Generalized slow spike wave (less than three per second)
- Prolonged overbreathing response
- Electroencephalogram artifact
- Abnormal EEG
- Focal episodic spikes
- Generalized non-paroxysmal EEG abnormality
- Generalized episodic EEG abnormality
- EEG abnormality without seizure
- Periodic complexes
- Subclinical rhythmical EEG discharges in adults
- Generalized intermittent theta activity
- Generalized electroencephalogram amplitude asymmetry
- Low amplitude EEG tracing
- Generalised EEG frequency asymmetry
- Electroencephalogram abnormality without seizure
- EEG artefact - patient movement
- EEG abnormality
- Bilateral periodic epileptiform discharges
- Focal episodic theta activity
- Subclinical rhythmical electroencephalogram discharges in adults
- Generalized electroencephalogram frequency asymmetry
- Focal continuous electroencephalogram abnormality
- Focal reduction of electroencephalogram activity
- Focal recruiting discharge
- Electroencephalogram (EEG) abnormalities
- Generalised EEG pattern - finding
- Generalised epileptiform discharges
- Positive spikes (including 14 and 6 per second)
- Reduction of alpha activity in left cerebral hemisphere
- Generalised continuous EEG abnormality
- EEG artifact - patient movement
- Generalized intermittent delta activity
- Isoelectric recording
- EEG symmetry - finding
- Alpha coma type recording
- Beta coma type recording
- Generalized paroxysmal EEG abnormality
- Generalized multifocal spikes
- Focal episodic delta activity
- Electroencephalogram abnormality with seizure
- Generalised electroencephalogram amplitude asymmetry
- Electroencephalogram pattern of uncertain significance
Frequently Asked Questions
What is the ICD-10 code for abnormal electroencephalogram [eeg]?
The ICD-10-CM code for abnormal electroencephalogram [eeg] is R94.01. The full clinical description is "Abnormal electroencephalogram [EEG]". R94.01 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code R94.01 mean?
ICD-10-CM code R94.01 represents “Abnormal electroencephalogram [EEG]”. It is classified under Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings and is a billable/specific code that can be used on a claim.
Is R94.01 a billable code?
Yes, R94.01 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is R94.01 in?
R94.01 is in Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (codes R00-R99).
What codes cannot be used with R94.01?
R94.01 has Excludes1 notes indicating codes that cannot be used together with it, including: abnormal findings on antenatal screening of mother (O28.-); diagnostic abnormal findings classified elsewhere - see Alphabetical Index.
What SNOMED CT codes does R94.01 map to?
R94.01 maps to 78 SNOMED CT concepts: 251509005, 251467006, 251510000, 251508002, 251513003, and 73 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for R94.01?
R94.01 is linked to 1 UMLS Concept Unique Identifier: C0151611. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does R94.01 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like abnormal electroencephalogram [eeg] affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of R94.01?
There is no direct ICD-11 mapping available for R94.01 in the WHO crosswalk tables. This may mean the concept is classified differently in ICD-11. Use the ICD-10 to ICD-11 converter to search for related codes.
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.