Q5101 is the HCPCS code for: Injection, filgrastim-sndz, biosimilar, (zarxio), 1 microgram. In 2024, 80 providers billed Q5101 1,869,848 times, with an estimated $470K paid by Medicare.
Q5101 is a Part B drug code: Medicare pays an ASP-based rate of $0.35 per 1 mcg (2026 Q3 ASP drug pricing file). Total payment per patient depends on the dose billed.
A billed "service" on this code is one 1 mcg unit, not one patient visit — that's why the service counts below run high.
What Medicare actually paid per service in 2024, on average: $0.25 (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 | Asit Choksi, MD | Hematology-Oncology | The Woodlands, TX | 155,282 | $34K |
| 2 | Paul Lin, MD | Hematology-Oncology | Wellington, FL | 154,020 | $41K |
| 3 | Michael Farrell, M.D., PH.D. | Hematology-Oncology | Middletown, CT | 110,763 | $29K |
| 4 | Bassam Ghanem, MD | Medical Oncology | Thousand Oaks, CA | 87,242 | $22K |
| 5 | Stephen F Austin Community Health Center,Inc | Pharmacy | Houston, TX | 66,450 | $16K |
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