No. J1955 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 J1955?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 4 NDCs under J1955, for Carnitor and Levocarnitine. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J1955?

$24.375 per 1 gm, 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.

J1955 J-Code: Carnitor (levocarnitine) — Billing Units

In short

J1955 is the HCPCS Level II code for injection, levocarnitine, per 1 gm. CMS assigns NDCs for Carnitor and Levocarnitine to it. The Medicare Part B payment limit is $24.375 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ1955

Billing unitSee descriptor

Descriptor: Injection, levocarnitine, per 1 gm
Short descriptor: Inj levocarnitine per 1 gm
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 1997

Medicare Part B payment limit

CMS ASP file

Payment limit per unit$24.375

Per1 gm

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 J1955

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 4 NDCs to J1955 for Carnitor and Levocarnitine. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J1955 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Carnitor	54482-0147-01	Leadiant Biosciences, Inc.	5 × 5	5
Levocarnitine	00143-9852-10	Hikma Pharmaceuticals USA Inc.	10 × 5	10
Levocarnitine	00517-1045-05	American Regent, Inc.	5 × 5	5
Levocarnitine	00517-1075-01	American Regent, Inc.	20	4

J1955: common questions

Is J1955 a CPT code?: No. J1955 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 J1955?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 4 NDCs under J1955, for Carnitor and Levocarnitine. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J1955?: $24.375 per 1 gm, 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.

J1955 — Injection, levocarnitine, per 1 gm