ICD-10-CM Code R94.01

Abnormal electroencephalogram [EEG]

Version 2020 Billable Code No Valid Principal Dx

Valid for Submission

R94.01 is a billable code used to specify a medical diagnosis of abnormal electroencephalogram [eeg]. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code R94.01 might also be used to specify conditions or terms like alpha amplitude asymmetry, alpha coma type recording, alpha frequency asymmetry, asymmetric beta activity, asymmetric eeg, asymmetrical mu activity, etc

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.

ICD-10:R94.01
Short Description:Abnormal electroencephalogram [EEG]
Long Description:Abnormal electroencephalogram [EEG]

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code R94.01 are found in the index:


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
  • 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 episodic unilateral three per second spike wave
  • 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
  • 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
  • Unilateral reduction of alpha activity

Convert R94.01 to ICD-9

  • 794.02 - Abn electroencephalogram

Code Classification

  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99)
    • Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94)
      • Abnormal results of function studies (R94)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020