How many J1120 billing units are in a package of Acetazolamide Sodium?

CMS lists 1 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. J1120 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.

Acetazolamide Sodium J-Code J1120 — Billing Units & NDCs

In short

Acetazolamide Sodium is billed under HCPCS J1120 — Injection, acetazolamide sodium, up to 500 mg. One billing unit is 500 mg. CMS's crosswalk lists 6 Acetazolamide Sodium NDCs under this code.

J1120 code details

Reference

J1120: Injection, acetazolamide sodium, up to 500 mgBilling unit: 500 mg
Labelers: Heritage Pharmaceuticals Inc.; Hikma Pharmaceuticals USA Inc.; Mylan Institutional LLC; XGen Pharmaceuticals DJB, Inc.

Medicare Part B payment limit

CMS ASP file

Payment limit per unit$23.951

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

Acetazolamide Sodium units and claim line

Enter the dose given to get the J1120 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.

Acetazolamide Sodium 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.

Acetazolamide Sodium NDCs in the CMS ASP crosswalk
NDC (11-digit)	HCPCS	Labeler	Package	Billing units per package
00143-9006-01	J1120	Hikma Pharmaceuticals USA Inc.	1	1
00143-9503-01	J1120	Hikma Pharmaceuticals USA Inc.	1	1
23155-0313-31	J1120	Heritage Pharmaceuticals Inc.	1	1
23155-0831-31	J1120	Heritage Pharmaceuticals Inc.	1	1
39822-0190-01	J1120	XGen Pharmaceuticals DJB, Inc.	1	1
67457-0853-50	J1120	Mylan Institutional LLC	1	1

Acetazolamide Sodium: common questions

What is the J-code for Acetazolamide Sodium?: Acetazolamide Sodium is billed under HCPCS J1120 — Injection, acetazolamide sodium, up to 500 mg. One billing unit is 500 mg. CMS's crosswalk lists 6 Acetazolamide Sodium NDCs under this code.
How many J1120 billing units are in a package of Acetazolamide Sodium?: CMS lists 1 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 J1120 a CPT code?: No. J1120 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.

Acetazolamide Sodium J-Code / HCPCS Code