Version 2024

No Valid Principal Dx

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2024 ICD-10-CM Diagnosis Code R94.131

Abnormal electromyogram [EMG]

ICD-10-CM Code:: R94.131
ICD-10 Code for:: Abnormal electromyogram [EMG]
Is Billable?: Yes - Valid for Submission
Chronic Condition Indicator: ^[1]: Not chronic
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Table of Contents

Code Information
Approximate Synonyms
Clinical Classification
Tabular List of Diseases and Injuries
Index to Diseases and Injuries References
Diagnostic Related Groups Mapping
Convert to ICD-9 Code
Patient Education
Other Codes Used Similar Conditions
Code History

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)

R94.131 is a billable diagnosis code used to specify a medical diagnosis of abnormal electromyogram [emg]. 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:

Anodal opening clonus
Asymmetry of F-wave
Asymmetry of H-response
Cathodal closure clonus
Cathodal opening clonus
Complex repetitive EMG discharges
Continuous motor unit activity
Decreased frequency of F-wave
Early recruitment of short duration polyphasic motor unit with abnormal spontaneous activity on electromyogram
Early recruitment of short duration polyphasic motor unit without abnormal spontaneous activity on electromyogram
Electrical EMG silence
Electromyogram abnormal
EMG decelerating bursts
EMG interference pattern - finding
EMG interference pattern - finding
EMG interference pattern - finding
EMG interference pattern - finding
EMG positive sharp waves
Exaggeration of H-response
F-wave finding
F-wave finding
F-wave finding
F-wave finding
F-wave finding
High amplitude reduced interference pattern with abnormal spontaneous activity on electromyogram
High amplitude reduced interference pattern without abnormal spontaneous activity on electromyogram
Increased chronodispersion of F-wave
Increased insertional activity
Increased latency of F-wave
Increased latency of H-response
Increased tacheodispersion of F-wave
Indeterminate EMG pattern
Interference pattern showing early recruitment
Interference pattern showing increased amplitude
Interference pattern showing reduced amplitude
Interference pattern showing reduced density
Loss of H-response
Motor unit characteristics - finding
Motor unit characteristics - finding
Motor unit characteristics - finding
Motor unit characteristics - finding
Motor unit characteristics - finding
Motor unit characteristics - finding
Motor unit morphology - finding
Motor unit morphology - finding
Motor unit morphology - finding
Motor unit morphology - finding
Motor unit stability - finding
Motor unit stability - finding
Motor units with extra discharges
Overall EMG pattern - finding
Overall EMG pattern - finding
Overall EMG pattern - finding
Overall EMG pattern - finding
Overall EMG pattern - finding
Overall EMG pattern - finding
Polyphasic units
Polyphasic units - long duration - finding
Polyphasic units - short duration - finding
Reaction of degeneration by electromyogram
Reaction of denervation by electromyogram
Single muscle fiber finding
Single muscle fiber jitter
Spontaneous EMG activity
Stable motor units
Stalberg cloud
Unstable motor units

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.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.

Type 1 Excludes

electromyogram of eye R94.113

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;
- - electromyogram [EMG] - R94.131

R94.131 is grouped with Diagnostic Related Groups - MS-DRG Mapping

Diagnostic Related Groups (DRGs) are a classification system used to group together diagnosis codes for the purpose of reimbursement and healthcare management. DRGs are used to standardize the way hospitals and other providers are paid for inpatient services. In this system patients are grouped together based on their principal diagnosis in areas referred to as Major Diagnostic Categories (MDC). Once a patient is assigned a particular diagnostic category, providers receive a predetermined payment rate for the services rendered. This reimbursement rate is often fixed and is meant to cover the cost of care for that patient. Reimbursement is also affected by the relative weight of a diagnostic related group based on the severity of a patient's illness and the associated cost of care during hospitalization.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The diagnosis code is present in the following groups for version MS-DRG V41.0 applicable from 10/01/2023 through 09/30/2024.

MS-DRG	MS-DRG Title	MCD	Relative Weight
564	OTHER MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE DIAGNOSES WITH MCC	08	1.5619
565	OTHER MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE DIAGNOSES WITH CC	08	0.9994
566	OTHER MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE DIAGNOSES WITHOUT CC/MCC	08	0.7505

The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Convert R94.131 to ICD-9-CM

ICD-9-CM Code: 794.17 - Abnorm electromyogram

Patient Education

Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.

Causes of muscle disorders include:

Injury or overuse, such as sprains or strains, cramps or tendinitis
A genetic disorder, such as muscular dystrophy
Some cancers
Inflammation, such as myositis
Diseases of nerves that affect muscles
Infections
Certain medicines

Sometimes the cause of muscle disorders is unknown.

[Learn More in MedlinePlus]

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.