CareCost Vials
1 × 750 mg
1 billing unit = 1 mg
750 mg dose → 750 billing units
J1439 · ferric carboxymaltose
100 mg / 500 mg / 750 mg / 1,000 mg single-dose vials · JZ when nothing is discarded
Calculate this patient's units ↓750 mg IDA/CKD, two-dose course · 1,000 mg single-dose alternative · 1,000 mg heart-failure Day 1
Injectafer · 200 billing units carry straight into the claim.
Claim Check builds the whole visit — J1439 units, the administration line, the modifiers and the Medicare allowed amount — and prices it against your payer's rate. The estimate turns the same visit into what the patient owes.
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Patient owes, 750 mg
Change the payer and the estimate re-prices against that payer's own published rate. The result is a good faith estimate for the patient.
J1439 bills 1 mg per unit: ordered dose ÷ 1 mg = billing units. A 500 mg dose is 500 units, a 750 mg dose is 750 units, and a 1,000 mg dose is 1,000 units — no rounding and no per-kilogram multiplication for any of the flat adult doses.
Injectafer ships in four single-dose vial sizes — 100 mg, 500 mg, 750 mg and 1,000 mg — and the calculator draws the fewest vials that cover the ordered dose, breaking any tie toward the least amount left over. The 750 mg course dose always draws one 750 mg vial, so JZ is the modifier. The 15 mg/kg single-dose alternative matches the 1,000 mg vial only at or above 66.7 kg; between 50 kg and 66.7 kg it lands between vial sizes — a 55 kg patient's 825 mg dose still draws one 1,000 mg vial, but 175 mg is discarded on a JW line. Under 50 kg, 15 mg/kg is weight-based dosing by definition, so JW is the routine outcome there too.
Medicare pays $1.132 per mg (ASP+6%), effective for claims in Q3 2026 — $849.00
for the 750 mg example above, before the $37.74 administration allowance.
| Dose | Billing units | Vials | Modifier | Note |
|---|---|---|---|---|
| 750 mg (IDA / non-dialysis CKD, first dose) | 750 | 1 × 750 mg | JZ | First of two doses, at least 7 days apart |
| 750 mg (second dose of the course) | 750 | 1 × 750 mg | JZ | Completes the 1,500 mg course |
| 1,000 mg (single-dose alternative, 15 mg/kg up to cap) | 1,000 | 1 × 1,000 mg | JZ | One visit instead of two |
| 500 mg (heart-failure maintenance, weeks 12/24/36) | 500 | 1 × 500 mg | JZ | Only if ferritin or TSAT is still low |
| 600 mg (40 kg, under 50 kg at 15 mg/kg) | 600 + 150 JW | 1 × 750 mg | JW | 150 mg discarded; 500 mg + 100 mg wastes nothing but opens two vials |
| 1,000 mg (heart failure, Day 1) | 1,000 | 1 × 1,000 mg | JZ | 500 mg instead when hemoglobin is over 14 to under 15 g/dL |
| 1,500 mg (course total, two visits) | 1,500 | 2 × 750 mg (one per visit) | JZ each visit | Two visits, at least 7 days apart |
JZ — no discarded drug from a single-dose container. JW — discarded drug from a single-dose container, reported on its own claim line. One of the two is required on every J1439 claim per CMS's July 1, 2023 single-dose container policy.
J1439 × 750 JZ · 96374 × 1. The 500 mg heart-failure maintenance dose works
the same way — it matches its vial size exactly, so JZ is the norm for both. The 1,000 mg single-dose
alternative only matches its vial size at or above 66.7 kg; below that weight the same 15 mg/kg dose still
draws a 1,000 mg vial with drug left over, billed JW.
J1439 × 600 · J1439 × 150 JW.
A pharmacy that instead draws one 500 mg vial plus one 100 mg vial delivers the same 600 mg with nothing left
over — but that combination opens a second vial, which is why the fewest-vials rule picks the 750 mg
vial and the JW line instead.
96374 is the administration code for every labeled Injectafer route; 96365 applies only when the chart documents a diluted infusion longer than 15 minutes. The label's undiluted slow IV push runs at about 100 mg per minute, so the 750 mg course dose takes about 7.5 minutes and the 1,000 mg single dose about 10 minutes — both a push, not an infusion. The label's other route dilutes the dose in up to 250 mL of 0.9% sodium chloride and runs it over at least 15 minutes; CPT reports an infusion of 15 minutes or less as a push, so 96365 is only supportable when the documented infusion time runs over 15 minutes, not merely because the dose was diluted. Injectafer has no “each additional hour” code at any dose — the manifest carries no additional administration code for this drug at all. The CPT 96374–96376 and CPT 96365–96366 pages carry the full definitions; this page only decides which side of the 15-minute line an Injectafer dose falls on.
Injectafer ships in four single-dose vial sizes — 100 mg/2 mL (NDC 0517-0602-01),
500 mg/10 mL (0517-0610-01), 750 mg/15 mL (0517-0650-01) and 1,000 mg/20 mL
(0517-0620-01) — the first drug on this site with more than one size. J1439
(“Injection, ferric carboxymaltose, 1 mg”) covers ferric carboxymaltose from any manufacturer;
American Regent's Injectafer is the reference product billed under that code. Five other IV iron agents
— Ferrlecit, Feraheme, INFeD, Venofer and Monoferric — are a different molecule each, with their
own HCPCS codes and their own unit math; none of them bills under J1439. See the
FDA Injectafer label
for full dosing and administration instructions, or the
current Medicare rate for J1439 →.
750 billing units. Injectafer J1439 bills 1 unit per 1 mg, so the dose in mg and the unit count are always the same number.
1,000 units, drawn from one 1,000 mg vial with nothing discarded. The label allows 15 mg/kg up to a 1,000 mg cap as a single dose instead of the two-dose 750 mg course, and any adult of about 66.7 kg or more reaches that cap.
J1439. It covers ferric carboxymaltose from any manufacturer, and American Regent's Injectafer is the reference product billed under that code.
JZ on the 750 mg course dose and the 500 mg heart-failure maintenance dose — both match a vial size exactly with nothing left over. The 1,000 mg single-dose alternative matches that cleanly only at or above 66.7 kg; below that weight the same 15 mg/kg dose still draws a 1,000 mg vial but leaves drug behind — a 55 kg patient's 825 mg dose discards 175 mg on a JW line. Under 50 kg, 15 mg/kg is weight-based dosing, so JW is routine there too.
Billing 8 units for a 750 mg dose because eight 100 mg vials were imagined, or billing 1 unit because one vial was drawn. J1439 is 1 mg per unit, not 1 vial per unit, so a 750 mg dose is 750 units — billing 1 unit instead pays $1.13 rather than $849.00.
Data current: pricing Q3 2026 · payer policies Aug 2026
Sources: CMS ASP pricing files (Q3 2026); CMS physician fee schedule; FDA-approved prescribing information (INJECTAFER label, American Regent, Revised 08/2026); CMS single-dose container JW/JZ policy (effective July 1, 2023); CPT codebook administration-code guidance.
Reviewed September 19, 2026 by Erin Rose, CareCost Estimate founder. Methodology →