No. J1645 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 J1645?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 9 NDCs under J1645, for Fragmin. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J1645?

$45.668 per 2500 iu, 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.

J1645 J-Code: Fragmin (dalteparin sodium) — Billing Units

In short

J1645 is the HCPCS Level II code for injection, dalteparin sodium, per 2500 iu. CMS assigns NDCs for Fragmin to it. The Medicare Part B payment limit is $45.668 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ1645

Billing unitSee descriptor

Descriptor: Injection, dalteparin sodium, per 2500 iu
Short descriptor: Dalteparin sodium
Code set: HCPCS Level II, maintained by CMS
Effective: Jul 1, 2002

Medicare Part B payment limit

CMS ASP file

Payment limit per unit$45.668

Per2500 iu

Coinsurance4.812%

Effective October 1, 2026 through December 31, 2026. Payment allowance limits subject to the ASP methodology are based on 2Q26 ASP data. CMS note: Inflation-adjusted coinsurance. 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 J1645

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 9 NDCs to J1645 for Fragmin. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J1645 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Fragmin	00069-0195-02	Pfizer Inc	10 × 0.2	10
Fragmin	00069-0196-02	Pfizer Inc	10 × 0.2	20
Fragmin	00069-0206-02	Pfizer Inc	10 × 0.3	30
Fragmin	00069-0217-02	Pfizer Inc	10 × 1	40
Fragmin	00069-0220-02	Pfizer Inc	10 × 0.5	50
Fragmin	00069-0223-02	Pfizer Inc	10 × 0.6	60
Fragmin	00069-0228-02	Pfizer Inc	10 × 0.72	72
Fragmin	00069-0232-01	Pfizer Inc	3.8	38
Fragmin	00069-0253-10	Pfizer Inc	10 × 4	40

J1645: common questions

Is J1645 a CPT code?: No. J1645 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 J1645?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 9 NDCs under J1645, for Fragmin. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J1645?: $45.668 per 2500 iu, 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.

J1645 — Injection, dalteparin sodium, per 2500 iu