J1561 is the HCPCS code for: Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg. In 2024, 206 providers billed J1561 1.8M times, an estimated $69.7M paid by Medicare.
J1561 is a Part B drug code: Medicare pays an ASP-based rate of $49.01 per 500 mg (2026 Q3 ASP drug pricing file). Total payment per patient depends on the dose billed.
A billed "service" on this code is one 500 mg unit, not one patient visit. That's why the service counts below run high.
What Medicare actually paid per service in 2024, on average: $38.33 (observed payment across all settings and modifiers, not a fee-schedule rate).
The top 5 billers nationally, ranked by 2024 Medicare service volume.
| # | Provider | Specialty | Location | Services | Est. Medicare paid |
|---|---|---|---|---|---|
| 1 | Guy Burrows, M.D. | Neurology | Shenandoah, TX | 345,020 | $13.3M |
| 2 | Philip Blum, MD | Neurology | Houston, TX | 48,678 | $1.9M |
| 3 | Bela Ajtai, MD, PHD | Neurology | Amherst, NY | 44,180 | $1.7M |
| 4 | Jeffrey Weber, M.D. | Gastroenterology | Milwaukee, WI | 38,330 | $1.5M |
| 5 | John Storheim, D.O. | Anesthesiology | Grand Junction, CO | 29,828 | $1.1M |
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