HCPCS drug code · CMS crosswalk
Acetazolamide J-Code / HCPCS Code
In short
Acetazolamide is billed under HCPCS J1120 — Injection, acetazolamide sodium, up to 500 mg. One billing unit is 500 mg. CMS's crosswalk lists 1 Acetazolamide NDC under this code.
Reference
- J1120
- Injection, acetazolamide sodium, up to 500 mgBilling unit: 500 mg
- Labelers
- Sagent Pharmaceuticals
Medicare Part B payment limit
CMS ASP filePayment 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 units and claim line
Enter the dose given to get the J1120 units and the NDC line for the CMS-1500 and the 837P.
Enter the dose given to build the claim line.
Acetazolamide 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.
| NDC (11-digit) | HCPCS | Labeler | Package | Billing units per package |
|---|---|---|---|---|
| 25021-0839-20 | J1120 | Sagent Pharmaceuticals | 1 | 1 |
Acetazolamide: common questions
- What is the J-code for Acetazolamide?
- Acetazolamide is billed under HCPCS J1120 — Injection, acetazolamide sodium, up to 500 mg. One billing unit is 500 mg. CMS's crosswalk lists 1 Acetazolamide NDC under this code.
- How many J1120 billing units are in a package of Acetazolamide?
- 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.