No. J2020 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 J2020?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 11 NDCs under J2020, for Linezolid and Zyvox. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J2020?

$2.431 per 200 mg, 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 J2020?

One unit of J2020 is 200 mg, as stated in the code's descriptor. Units to report = dose given ÷ 200 mg.

J2020 J-Code: Zyvox (linezolid) — Billing Units & NDCs

In short

J2020 is the HCPCS Level II code for injection, linezolid, 200 mg. CMS assigns NDCs for Linezolid and Zyvox to it. One billing unit is 200 mg. The Medicare Part B payment limit is $2.431 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ2020

Billing unit200 mg

Descriptor: Injection, linezolid, 200 mg
Short descriptor: Linezolid injection
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 2018

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$2.431

Per200 mg

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 ÷ 200 mg. For example, 20000 mg is 100 units. Enter the dose to get the units and the NDC line for the CMS-1500 and the 837P.

Dose given (mg)

HCPCS units (1 unit = 200 mg)

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the dose given to build the claim line.

NDCs billed under J2020

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 11 NDCs to J2020 for Linezolid and Zyvox. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J2020 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Linezolid	00143-9534-10	Hikma Pharmaceuticals USA Inc.	10 × 300	30
Linezolid	00781-3433-95	Sandoz Inc.	10 × 300	30
Linezolid	25021-0169-87	Sagent Pharmaceuticals	10 × 300	30
Linezolid	55150-0242-51	Eugia US LLC	10 × 300	30
Linezolid	57664-0683-57	Caraco Pharmaceutical Laboratories LTD.	10 × 300	30
Linezolid	63323-0713-13	FreseniUS Kabi USA, LLC	10 × 300	30
Linezolid	66794-0219-43	Piramal Critical Care Inc	10 × 300	30
Linezolid	66794-0236-43	Piramal Critical Care Inc	10 × 300	30
Zyvox	00009-5137-04	Pfizer Inc	10 × 100	10
Zyvox	00009-5140-04	Pfizer Inc	10 × 300	30
Zyvox	00009-7807-02	Pfizer Inc	10 × 300	30

J2020: common questions

Is J2020 a CPT code?: No. J2020 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 J2020?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 11 NDCs under J2020, for Linezolid and Zyvox. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J2020?: $2.431 per 200 mg, 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 J2020?: One unit of J2020 is 200 mg, as stated in the code's descriptor. Units to report = dose given ÷ 200 mg. J-code billing units.

J2020 — Injection, linezolid, 200 mg