How many J1335 billing units are in a package of Ertapenem?

CMS lists 10 to 20 billing units per package, depending on the NDC, where one unit is 500 mg. Units to report are based on the dose given, not the package.

No. J1335 is a HCPCS Level II code from CMS for the drug itself. Giving it, for example by injection or infusion, is usually reported with a separate CPT administration code.

Ertapenem J-Code J1335 — Billing Units & NDCs

In short

Ertapenem is billed under HCPCS J1335 — Injection, ertapenem sodium, 500 mg. One billing unit is 500 mg. CMS's crosswalk lists 16 Ertapenem NDCs under this code.

J1335 code details

Reference

J1335: Injection, ertapenem sodium, 500 mgBilling unit: 500 mg
Labelers: Apotex Corp; BluePoint Laboratories; Dr. Reddy's Laboratories Inc.; Endo USA, Inc.; Eugia US LLC; Fosun Pharma USA Inc.; FreseniUS Kabi USA, LLC; Hikma Pharmaceuticals USA Inc.and 4 more

Medicare Part B payment limit

CMS ASP file

Payment limit per unit$5.826

Per500 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

Ertapenem units and claim line

Enter the dose given to get the J1335 units and the NDC line for the CMS-1500 and the 837P.

Dose given (mg)

HCPCS units (1 unit = 500 mg)

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the dose given to build the claim line.

Ertapenem NDCs and billing units

From CMS’s ASP NDC–HCPCS crosswalk, effective October 1, 2026 through December 31, 2026. Billing units per package are CMS’s figures for the code’s unit.

Ertapenem NDCs in the CMS ASP crosswalk
NDC (11-digit)	HCPCS	Labeler	Package	Billing units per package
00143-9398-10	J1335	Hikma Pharmaceuticals USA Inc.	10 × 1	20
00143-9429-10	J1335	Hikma Pharmaceuticals USA Inc.	10 × 1	20
00409-3510-22	J1335	Pfizer Inc	10 × 1	20
16714-0889-10	J1335	Northstar RxLLC	10 × 1	20
25021-0199-20	J1335	Sagent Pharmaceuticals	10 × 1	20
42023-0221-10	J1335	Endo USA, Inc.	10 × 1	20
42023-0221-85	J1335	Endo USA, Inc.	10 × 1	20
43598-0901-58	J1335	Dr. Reddy's Laboratories Inc.	10 × 1	20
44567-0820-10	J1335	WG Critical Care, LLC	10 × 1	20
55150-0282-09	J1335	Eugia US LLC	10 × 1	20
55150-0282-20	J1335	Eugia US LLC	10 × 1	20
60505-6196-04	J1335	Apotex Corp	10 × 1	20
63323-0823-20	J1335	FreseniUS Kabi USA, LLC	10 × 1	20
68001-0408-31	J1335	BluePoint Laboratories	10 × 1	20
72266-0159-05	J1335	Fosun Pharma USA Inc.	5 × 1	10
72266-0159-10	J1335	Fosun Pharma USA Inc.	10 × 1	20

Ertapenem: common questions

What is the J-code for Ertapenem?: Ertapenem is billed under HCPCS J1335 — Injection, ertapenem sodium, 500 mg. One billing unit is 500 mg. CMS's crosswalk lists 16 Ertapenem NDCs under this code.
How many J1335 billing units are in a package of Ertapenem?: CMS lists 10 to 20 billing units per package, depending on the NDC, where one unit is 500 mg. Units to report are based on the dose given, not the package.
Is J1335 a CPT code?: No. J1335 is a HCPCS Level II code from CMS for the drug itself. Giving it, for example by injection or infusion, is usually reported with a separate CPT administration code.

Ertapenem J-Code / HCPCS Code