Top billers · Codes · Q5101

Who bills Q5101?

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.

$0.35
per 1 mcg (2026 ASP file)
80
Providers billing it (2024)
1,869,848
Services billed
$470K
Est. Medicare paid
The fee

What does Medicare pay for Q5101?

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.

ASP-based payment limit$0.35 per 1 mcg
Pricing file2026 Q3 Average Sales Price (ASP)

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 list

Who bills Q5101 the most.

The top 5 billers nationally, ranked by 2024 Medicare service volume.

#ProviderSpecialtyLocationServicesEst. Medicare paid
1Asit Choksi, MDHematology-OncologyThe Woodlands, TX155,282$34K
2Paul Lin, MDHematology-OncologyWellington, FL154,020$41K
3Michael Farrell, M.D., PH.D.Hematology-OncologyMiddletown, CT110,763$29K
4Bassam Ghanem, MDMedical OncologyThousand Oaks, CA87,242$22K
5Stephen F Austin Community Health Center,IncPharmacyHouston, TX66,450$16K

75 more providers billed Q5101 in 2024. The full ranked list — filtered to your exact territory, with phone numbers and year-over-year history — is one search in Prospect 811.

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The breakdown

Where Q5101 gets billed.

Top states by volume

Florida479,640 services
California365,475 services
Texas282,512 services
Connecticut199,383 services
Nevada197,581 services
Colorado70,800 services
New York39,136 services
Indiana36,420 services

About this code

CMS descriptionInjection, filgrastim-sndz, biosimilar, (zarxio), 1 microgram
Code typeHCPCS Level II
Providers billing it (2024)80
Services billed (2024)1,869,848
Avg. Medicare payment per service (2024)$0.25
Where these numbers come from. Rates are CMS's own public fee-schedule files — the Physician Fee Schedule, Clinical Laboratory Fee Schedule, ASP drug pricing, DMEPOS, and the OPPS/ASC addenda — each labeled with its file year on this page; national amounts are shown before geographic adjustment. Codes with no separate rate render the fee schedule's own status in words, never a fake $0. Utilization comes from CMS's public Medicare Provider Utilization & Payment data for 2024, the most recent year released. It covers traditional Medicare fee-for-service only (no commercial insurance, no Medicare Advantage), and CMS suppresses any provider-and-code line with fewer than 11 beneficiaries before publishing, so low-volume billers don't appear at all. "Est. Medicare paid" is each billing line's average Medicare payment times its service count, summed — actual per-claim payment varies by setting and modifiers. For drug and supply codes, a "service" is a billed unit (a milligram, a milliliter, a square centimeter), not a patient visit. Code descriptions are CMS's own, from the utilization files. Prospect 811 organizes public data; it doesn't add to or alter it. Not affiliated with or endorsed by CMS. Full detail on the data page.

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