J9312 is the HCPCS code for: Injection, rituximab, 10 mg. In 2024, 336 providers billed J9312 1,277,588 times, with an estimated $76.9M paid by Medicare.
J9312 is a Part B drug code: Medicare pays an ASP-based rate of $73.28 per 10 mg (2026 Q3 ASP drug pricing file). Total payment per patient depends on the dose billed.
A billed "service" on this code is one 10 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: $60.20 (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 | Barry Eibschutz, M.D. | Rheumatology | San Luis Obispo, CA | 24,500 | $1.5M |
| 2 | Thomas Niederman, MD,PHD | Medical Oncology | Boynton Beach, FL | 18,790 | $1.2M |
| 3 | Vinh-Linh Nguyen, MD | Hematology-Oncology | Bakersfield, CA | 13,760 | $834K |
| 4 | Sona Kamat, M.D. | Internal Medicine | Saint Louis, MO | 13,300 | $806K |
| 5 | Theerapol Prasertsuntarasai, MD | Rheumatology | Lubbock, TX | 13,050 | $794K |
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