2024 ICD-10-CM Diagnosis Code R94.01
Abnormal electroencephalogram [EEG]
- ICD-10-CM Code:
- R94.01
- ICD-10 Code for:
- Abnormal electroencephalogram [EEG]
- Is Billable?
- Yes - Valid for Submission
- Chronic Condition Indicator: [1]
- Not chronic
- Code Navigator:
R94.01 is a billable diagnosis code used to specify a medical diagnosis of abnormal electroencephalogram [eeg]. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.
According to ICD-10-CM guidelines this code should not to be used as a principal diagnosis code when a related definitive diagnosis has been established.
Approximate Synonyms
The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:
- Alpha amplitude asymmetry
- Alpha coma type recording
- Alpha frequency asymmetry
- Asymmetric beta activity
- Asymmetric EEG
- Asymmetrical mu activity
- Beta coma type recording
- Bilateral periodic epileptiform discharges
- Burst suppression
- Café-au-lait macules with temporal dysrhythmia
- Continuous periodic complexes
- Dominant alpha activity
- Dominant beta activity
- Dominant delta activity
- Dominant EEG frequency - finding
- Dominant EEG frequency - finding
- Dominant EEG frequency - finding
- Dominant EEG frequency - finding
- Dominant theta activity
- EEG abnormality with seizure
- EEG abnormality without seizure
- EEG artifact
- EEG artifact - patient movement
- EEG artifact - technical problems
- EEG pattern of uncertain significance
- EEG pattern of uncertain significance
- EEG pattern of uncertain significance
- EEG pattern of uncertain significance
- EEG pattern of uncertain significance
- EEG pattern of uncertain significance
- EEG symmetry - finding
- EEG symmetry - finding
- EEG symmetry - finding
- EEG symmetry - finding
- EEG symmetry - finding
- EEG symmetry - finding
- Electrocerebral silence
- Electroencephalogram abnormal
- Excessive overbreathing response
- Focal continuous delta activity
- Focal continuous EEG abnormality
- Focal continuous theta activity
- Focal episodic delta activity
- Focal episodic EEG abnormality
- Focal episodic sharp waves
- Focal episodic spike wave
- Focal episodic spike wave with secondary generalization
- Focal episodic spikes
- Focal episodic theta activity
- Focal recruiting discharge
- Focal reduction of EEG activity
- Focal rolandic spikes
- Focal sharp waves
- Focal spikes
- Frontal intermittent rhythmic delta activity
- Generalized atypical spike wave
- Generalized continuous EEG abnormality
- Generalized EEG amplitude asymmetry
- Generalized EEG frequency asymmetry
- Generalized EEG pattern - finding
- Generalized EEG pattern - finding
- Generalized EEG pattern - finding
- Generalized EEG pattern - finding
- Generalized epileptiform discharges
- Generalized episodic EEG abnormality
- Generalized intermittent delta activity
- Generalized intermittent theta activity
- Generalized multifocal spikes
- Generalized slow spike wave
- Generalized three per second spike wave
- Intermittent periodic complexes
- Isoelectric recording
- Light-induced EEG abnormality
- Loss of reactivity
- Low amplitude EEG tracing
- Low amplitude six per second spike wave
- Low frequency alpha activity
- Low frequency background activity
- Low frequency delta activity
- Low frequency theta activity
- Occipital intermittent rhythmic delta activity
- Periodic complexes
- Periodic lateralized epileptiform discharges
- Positive spikes
- Prolonged overbreathing response
- Reduction of alpha activity in left cerebral hemisphere
- Reduction of alpha activity in right cerebral hemisphere
- Rhythmic mid-temporal discharge
- Small sharp transients during sleep
- Sound-induced EEG abnormality
- Subclinical rhythmical EEG discharges in adults
- Temporal slowing
- Trace alternant EEG pattern
- Triphasic waves
Clinical Classification
Clinical Category is Abnormal findings without diagnosis
- CCSR Category Code: SYM017
- Inpatient Default CCSR: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.
- Outpatient Default CCSR: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.
Index to Diseases and Injuries References
The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).
- - Abnormal, abnormality, abnormalities - See Also: Anomaly;
- - electroencephalogram [EEG] - R94.01
Convert R94.01 to ICD-9-CM
- ICD-9-CM Code: 794.02 - Abn electroencephalogram
Code History
- FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
- FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
- FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
- FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
- FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
- FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
- FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
- FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
- FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.