No. J1642 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 J1642?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 10 NDCs under J1642, for Heparin (Porcine) Lock Flush. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J1642?

$0.018 per 10 units, 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 J1642?

One unit of J1642 is 10 units, as stated in the code's descriptor. Units to report = dose given ÷ 10 units.

J1642 J-Code: Heparin sodium — Billing Units & NDCs

In short

J1642 is the HCPCS Level II code for injection, heparin sodium, (heparin lock flush), per 10 units. CMS assigns NDCs for Heparin (Porcine) Lock Flush to it. One billing unit is 10 units. The Medicare Part B payment limit is $0.018 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ1642

Billing unit10 units

Descriptor: Injection, heparin sodium, (heparin lock flush), per 10 units
Short descriptor: Inj heparin sodium per 10 u
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 1997

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$0.018

Per10 units

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

Units = dose given ÷ 10 units. For example, 1000 units is 100 units. Enter the dose to get the units and the NDC line for the CMS-1500 and the 837P.

Dose given (units)

HCPCS units (1 unit = 10 units)

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the dose given to build the claim line.

NDCs billed under J1642

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 10 NDCs to J1642 for Heparin (Porcine) Lock Flush. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J1642 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Heparin (Porcine) Lock Flush	64253-0222-21	Medefil, Inc.	60 × 1	60
Heparin (Porcine) Lock Flush	64253-0222-23	Medefil, Inc.	60 × 3	180
Heparin (Porcine) Lock Flush	64253-0222-33	Medefil, Inc.	60 × 3	180
Heparin (Porcine) Lock Flush	64253-0222-35	Medefil, Inc.	60 × 5	300
Heparin (Porcine) Lock Flush	64253-0333-21	Medefil, Inc.	60 × 1	600
Heparin (Porcine) Lock Flush	64253-0333-23	Medefil, Inc.	60 × 3	1,800
Heparin (Porcine) Lock Flush	64253-0333-33	Medefil, Inc.	60 × 3	1,800
Heparin (Porcine) Lock Flush	64253-0333-35	Medefil, Inc.	60 × 5	3,000
Heparin (Porcine) Lock Flush	64253-0444-22	Medefil, Inc.	60 × 1	12
Heparin (Porcine) Lock Flush	64253-0444-25	Medefil, Inc.	60 × 5	30

J1642: common questions

Is J1642 a CPT code?: No. J1642 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 J1642?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 10 NDCs under J1642, for Heparin (Porcine) Lock Flush. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J1642?: $0.018 per 10 units, 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 J1642?: One unit of J1642 is 10 units, as stated in the code's descriptor. Units to report = dose given ÷ 10 units. J-code billing units.

J1642 — Injection, heparin sodium, (heparin lock flush), per 10 units