No. J1571 is a HCPCS Level II code, maintained by CMS, that identifies the drug supplied. CPT codes are five-digit numbers from the AMA that describe services. Giving the drug, for example an injection or infusion, is usually reported with a separate CPT administration code.

What NDCs are billed under J1571?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J1571, for Hepagam B. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J1571?

$71.585 per 0.5 ml, effective October 1, 2026 through December 31, 2026, from CMS's Part B drug payment limit file. Multiply by the units billed for the allowed amount before deductible and coinsurance. It is not a coverage decision.

What is one billing unit of J1571?

One unit of J1571 is 0.5 ml, as stated in the code's descriptor. Units to report = dose given ÷ 0.5 ml.

J1571 J-Code: Hepagam B (hepatitis b immune globulin)

In short

J1571 is the HCPCS Level II code for injection, hepatitis b immune globulin (hepagam b), intramuscular, 0.5 ml. CMS assigns NDCs for Hepagam B to it. One billing unit is 0.5 ml. The Medicare Part B payment limit is $71.585 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ1571

Billing unit0.5 ml

Descriptor: Injection, hepatitis b immune globulin (hepagam b), intramuscular, 0.5 ml
Short descriptor: Hepagam b im injection
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 2009

The billing unit is read from the descriptor. Confirm it against the CMS file before billing.

Medicare Part B payment limit

CMS ASP file

Payment limit per unit$71.585

Per0.5 ml

Coinsurance20%

Effective October 1, 2026 through December 31, 2026. Payment allowance limits subject to the ASP methodology are based on 2Q26 ASP data. A payment limit is not a coverage decision; the Medicare contractor decides coverage. CMS ASP pricing files

Units and claim line

Enter the dose to get the units and the NDC line for the CMS-1500 and the 837P.

HCPCS units

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the units to build the claim line.

NDCs billed under J1571

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 2 NDCs to J1571 for Hepagam B. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J1571 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Hepagam B	49591-0051-51	Kamada Ltd.	5	10
Hepagam B	49591-0052-51	Kamada Ltd.	1	2

J1571: common questions

Is J1571 a CPT code?: No. J1571 is a HCPCS Level II code, maintained by CMS, that identifies the drug supplied. CPT codes are five-digit numbers from the AMA that describe services. Giving the drug, for example an injection or infusion, is usually reported with a separate CPT administration code. CPT codes for drug administration.
What NDCs are billed under J1571?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J1571, for Hepagam B. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J1571?: $71.585 per 0.5 ml, effective October 1, 2026 through December 31, 2026, from CMS's Part B drug payment limit file. Multiply by the units billed for the allowed amount before deductible and coinsurance. It is not a coverage decision.
What is one billing unit of J1571?: One unit of J1571 is 0.5 ml, as stated in the code's descriptor. Units to report = dose given ÷ 0.5 ml. J-code billing units.

J1571 — Injection, hepatitis b immune globulin (hepagam b), intramuscular, 0.5 ml