G73.3: Myasthenic syndromes in other diseases classified elsewhere
G73.3, myasthenic syndromes in other diseases classified elsewhere, is listed as a covered diagnosis in 13 Medicare billing and coding articles that apply to 23 HCPCS Level II codes, including J1569 (Injection, immune globulin, (gammagard liquid/gammagard…), J1561 (Injection, immune globulin, (gamunex-c/gammaked)…), J1459 (Injection, immune globulin (privigen), intravenous…). The articles come from 7 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 G73.3 as a covered diagnosis
| Code | Description | Medicare coverage | DMEPOS fee 2026 (state range) | Articles listing it |
|---|---|---|---|---|
| J1569 | Injection, immune globulin, (gammagard liquid/gammagard liquid erc), 500 mg | Special coverage instructions apply | — | 5 |
| J1561 | Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg | Special coverage instructions apply | — | 5 |
| J1459 | Injection, immune globulin (privigen), intravenous, non-lyophilized (e.g., liquid), 500 mg | Carrier judgment | — | 5 |
| J1576 | Injection, immune globulin (panzyga), intravenous, non-lyophilized (e.g., liquid), 500 mg | Special coverage instructions apply | — | 5 |
| J1557 | Injection, immune globulin, (gammaplex), intravenous, non-lyophilized (e.g., liquid), 500 mg | Carrier judgment | — | 5 |
| J1556 | Injection, immune globulin (bivigam), 500 mg | Carrier judgment | — | 5 |
| J1568 | Injection, immune globulin, (octagam), intravenous, non-lyophilized (e.g., liquid), 500 mg | Carrier judgment | — | 5 |
| J1566 | Injection, immune globulin, intravenous, lyophilized (e.g., powder), not otherwise specified, 500 mg | Special coverage instructions apply | — | 5 |
| J1554 | Injection, immune globulin (asceniv), 500 mg | Carrier judgment | — | 5 |
| J1552 | Injection, immune globulin (alyglo), 500 mg | Carrier judgment | — | 4 |
| J1577 | Injection, immune globulin (qivigy), 100 mg | Carrier judgment | — | 4 |
| J1553 | Injection, immune globulin (yimmugo), 100 mg | Carrier judgment | — | 3 |
| J1599 | Injection, immune globulin, intravenous, non-lyophilized (e.g., liquid), not otherwise specified, 500 mg | Carrier judgment | — | 3 |
| J1559 | Injection, immune globulin (hizentra), 100 mg | Carrier judgment | — | 2 |
| J1555 | Injection, immune globulin (cuvitru), 100 mg | Carrier judgment | — | 2 |
| J1575 | Injection, immune globulin/hyaluronidase, (hyqvia), 100 mg immuneglobulin | Carrier judgment | — | 2 |
| J1558 | Injection, immune globulin (xembify), 100 mg | Carrier judgment | — | 2 |
| J1551 | Injection, immune globulin (cutaquig), 100 mg | Carrier judgment | — | 2 |
| J1572 | Injection, immune globulin, (flebogamma/flebogamma dif), intravenous, non-lyophilized (e.g., liquid), 500 mg | Special coverage instructions apply | — | 2 |
| G0127 | Trimming of dystrophic nails, any number | Special coverage instructions apply | — | 3 |
| J2791 | Injection, rho(d) immune globulin (human), (rhophylac), intramuscular or intravenous, 100 iu | Special coverage instructions apply | — | 1 |
| J2792 | Injection, rho d immune globulin, intravenous, human, solvent detergent, 100 iu | 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 G73.3
- A57187: Billing and Coding: Immune Globulin Intravenous (IVIg) (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B); 13 Level II codes). LCD with the same title: L34314
- A56786: Billing and Coding: Immune Globulin (Novitas Solutions, Inc. (MAC - Part A, MAC - Part B); 18 Level II codes). LCD with the same title: L34007, L35093
- A57778: Billing and Coding: Immune Globulin (First Coast Service Options, Inc. (MAC - Part A, MAC - Part B); 18 Level II codes). LCD with the same title: L34007, L35093
- A56718: Billing and Coding: Intravenous Immunoglobulin (IVIG) (Palmetto GBA (MAC - Part A, MAC - Part B); 13 Level II codes). LCD with the same title: L34580
- A57759: Billing and Coding: Routine Foot Care and Debridement of Nails (Wellpoint Federal (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L33636, L34246
- A59105: Billing and Coding: Off-Label Use of Intravenous Immune Globulin (IVIG) (Wellpoint Federal (MAC - Part A, MAC - Part B); 11 Level II codes). LCD with the same title: L39314
- A57193: Billing and Coding: Routine Foot Care and Debridement of Nails (CGS Administrators, LLC (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L33636, L34246
- A57188: Billing and Coding: Routine Foot Care (First Coast Service Options, Inc. (MAC - Part B); 1 Level II codes). LCD with the same title: L33941, L35138, L37643
- 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
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 G73 diagnoses (Disorders of myoneural junction and muscle in diseases classified elsewhere)
- G73.1 — Lambert-Eaton syndrome in neoplastic disease
- G73.7 — Myopathy in diseases classified elsewhere
Frequently asked questions
Does Medicare cover G73.3 (Myasthenic syndromes in other diseases classified elsewhere)?
Medicare covers items and services, not diagnoses. 13 Medicare billing and coding articles list G73.3 as a covered diagnosis for 23 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 G73.3?
The Level II codes from the policies most specific to this diagnosis are J1569 (Injection, immune globulin, (gammagard liquid/gammagard…, 5 articles); J1561 (Injection, immune globulin, (gamunex-c/gammaked)…, 5 articles); J1459 (Injection, immune globulin (privigen), intravenous…, 5 articles); J1576 (Injection, immune globulin (panzyga), intravenous…, 5 articles); J1557 (Injection, immune globulin, (gammaplex), intravenous…, 5 articles). Code choice depends on the item supplied; check each code's descriptor.
Which Medicare policy articles list G73.3?
A57187 (Billing and Coding: Immune Globulin Intravenous (IVIg)); A56786 (Billing and Coding: Immune Globulin); A57778 (Billing and Coding: Immune Globulin), and 10 more articles.
What is ICD-10-CM code G73.3?
G73.3 is the ICD-10-CM code for myasthenic syndromes in other diseases classified elsewhere, in category G73 (Disorders of myoneural junction and muscle in diseases classified elsewhere), chapter 6: Diseases of the nervous system.
Next steps
- Run a reimbursement report for a device billed under J1569
- Watch J1569 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for J1569
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 6: Diseases of the nervous system · All diagnoses · HCPCS lookup