HCPCS drug code · CMS crosswalk
Naficillin Sodium J-Code / HCPCS Code
In short
Naficillin Sodium is billed under HCPCS J2290 — Injection, nafcillin sodium, 20 mg. One billing unit is 20 mg. CMS's crosswalk lists 1 Naficillin Sodium NDC under this code.
Reference
- J2290
- Injection, nafcillin sodium, 20 mgBilling unit: 20 mg
- Labelers
- Avenacy Inc.
Medicare Part B payment limit
CMS ASP filePayment limit per unit$0.047
Per20 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
Naficillin Sodium units and claim line
Enter the dose given to get the J2290 units and the NDC line for the CMS-1500 and the 837P.
Enter the dose given to build the claim line.
Naficillin 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.
| NDC (11-digit) | HCPCS | Labeler | Package | Billing units per package |
|---|---|---|---|---|
| 83634-0101-99 | J2290 | Avenacy Inc. | 1 | 500 |
Naficillin Sodium: common questions
- What is the J-code for Naficillin Sodium?
- Naficillin Sodium is billed under HCPCS J2290 — Injection, nafcillin sodium, 20 mg. One billing unit is 20 mg. CMS's crosswalk lists 1 Naficillin Sodium NDC under this code.
- How many J2290 billing units are in a package of Naficillin Sodium?
- CMS lists 500 billing units per package, depending on the NDC, where one unit is 20 mg. Units to report are based on the dose given, not the package.
- Is J2290 a CPT code?
- No. J2290 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.