HCPCS code J1442: Filgrastim injection, per 1 microgram2026 Medicare rate & RVUs

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What J1442 covers

J1442 represents filgrastim, a granulocyte colony-stimulating factor that promotes neutrophil production. Oncology and hematology practices commonly furnish it to help prevent or reduce neutropenia associated with myelosuppressive chemotherapy, and it is also used in settings such as severe chronic neutropenia or peripheral blood stem-cell mobilization. The code is for filgrastim itself, not a biosimilar product; the drug may be given subcutaneously or intravenously according to the prescribed regimen.

CMS assigns this code physician fee schedule status E, meaning it is excluded from the physician fee schedule. When Medicare covers the drug, payment is through another method; HCPCS pricing identifies it as a Part B drug generally priced using CMS quarterly ASP drug pricing files. Special Medicare coverage instructions apply. Each billing unit represents 1 microgram, so report units based on the administered filgrastim dose. The code represents the drug quantity, not the administration service.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

Where J1442 pays more and less

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

J1442 rates by state

Office rate range in each state. Select a state to see its payment localities.

How the J1442 rate is calculated

Each of J1442’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

Payment rules and modifiers for J1442

J1442 has no global surgery period, no multiple-procedure, bilateral or assistant-at-surgery adjustment, and no professional/technical split. What changes the payment is where the service happens: the place of service on the claim decides whether Medicare pays the office or the facility rate.

J1442 compared with similar codes

How to choose

J1447Tbo-filgrastimPer 1 mcg

J1447 is for tbo-filgrastim, not the non-biosimilar filgrastim represented by J1442. Match the code to the drug product administered.

Q5101Zarxio injectionPer 1 mcg

Q5101 identifies filgrastim-sndz, a biosimilar; J1442 excludes biosimilar filgrastim products.

Q5110NivestymPer 1 mcg

Q5110 identifies filgrastim-aafi, a biosimilar product. J1442 applies to non-biosimilar filgrastim.

Codes related to J1442

Related codes aren’t interchangeable: bill the code that matches the service performed.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates