R94.131: Abnormal electromyogram [EMG]
R94.131, abnormal electromyogram [EMG], is listed as a covered diagnosis in 6 Medicare billing and coding articles that apply to 3 HCPCS Level II codes, including A9585 (Injection, gadobutrol, 0.1 ml), Q9953 (Injection, iron-based magnetic resonance contrast agent…), G0255 (Current perception threshold/sensory nerve conduction…). The articles come from 5 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.
HCPCS Level II codes with R94.131 as a covered diagnosis
| Code | Description | Medicare coverage | DMEPOS fee 2026 (state range) | Articles listing it |
|---|---|---|---|---|
| A9585 | Injection, gadobutrol, 0.1 ml | Carrier judgment | — | 1 |
| Q9953 | Injection, iron-based magnetic resonance contrast agent, per ml | Special coverage instructions apply | — | 1 |
| G0255 | Current perception threshold/sensory nerve conduction test, (snct) per limb, any nerve | Non-covered by Medicare | Not covered | 5 |
Medicare policy articles listing R94.131
- A57307: Billing and Coding: Nerve Conduction Studies and Electromyography (CGS Administrators, LLC (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- A57478: Billing and Coding: Nerve Conduction Studies and Electromyography (WPS Insurance Corporation (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- A54969: Billing and Coding: Nerve Conduction Studies and Electromyography (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- A57668: Billing and Coding: Nerve Conduction Studies and Electromyography (Wellpoint Federal (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- A56619: Billing and Coding: Nerve Conduction Studies and Electromyography (Palmetto GBA (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34594, L34859, L35048, L35081
- A57206: Billing and Coding: Lumbar MRI (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B); 2 Level II codes). LCD with the same title: L34220
A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.
Other R94 diagnoses (Abnormal results of function studies)
- R94.2 — Abnormal results of pulmonary function studies
- R94.30 — Abnormal result of cardiovascular function study, unspecified
- R94.31 — Abnormal electrocardiogram [ECG] [EKG]
- R94.39 — Abnormal result of other cardiovascular function study
Frequently asked questions
Does Medicare cover R94.131 (Abnormal electromyogram [EMG])?
Medicare covers items and services, not diagnoses. 6 Medicare billing and coding articles list R94.131 as a covered diagnosis for 3 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.
Which HCPCS codes can be billed with ICD-10 R94.131?
The Level II codes from the policies most specific to this diagnosis are A9585 (Injection, gadobutrol, 0.1 ml, 1 article); Q9953 (Injection, iron-based magnetic resonance contrast agent…, 1 article); G0255 (Current perception threshold/sensory nerve conduction…, 5 articles). Code choice depends on the item supplied; check each code's descriptor.
Which Medicare policy articles list R94.131?
A57307 (Billing and Coding: Nerve Conduction Studies and Electromyography); A57478 (Billing and Coding: Nerve Conduction Studies and Electromyography); A54969 (Billing and Coding: Nerve Conduction Studies and Electromyography), and 3 more articles.
What is ICD-10-CM code R94.131?
R94.131 is the ICD-10-CM code for abnormal electromyogram [EMG], in category R94 (Abnormal results of function studies), chapter 18: Symptoms, signs and abnormal findings.
Next steps
- Run a reimbursement report for a device billed under A9585
- Watch A9585 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A9585
Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.
Chapter 18: Symptoms, signs and abnormal findings · All diagnoses · HCPCS lookup