HCPCS drug code · CMS crosswalk
Mesnex J-Code / HCPCS Code
In short
Mesnex is billed under HCPCS J9209 — Injection, mesna, 200 mg. One billing unit is 200 mg. CMS's crosswalk lists 1 Mesnex NDC under this code.
Reference
- J9209
- Injection, mesna, 200 mgBilling unit: 200 mg
- Labelers
- Baxter Healthcare Corporation
Medicare Part B payment limit
CMS ASP filePayment limit per unit$1.203
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
Mesnex units and claim line
Enter the dose given to get the J9209 units and the NDC line for the CMS-1500 and the 837P.
Enter the dose given to build the claim line.
Mesnex 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 |
|---|---|---|---|---|
| 00338-1305-01 | J9209 | Baxter Healthcare Corporation | 10 | 5 |
Mesnex: common questions
- What is the J-code for Mesnex?
- Mesnex is billed under HCPCS J9209 — Injection, mesna, 200 mg. One billing unit is 200 mg. CMS's crosswalk lists 1 Mesnex NDC under this code.
- How many J9209 billing units are in a package of Mesnex?
- CMS lists 5 billing units per package, depending on the NDC, where one unit is 200 mg. Units to report are based on the dose given, not the package.
- Is J9209 a CPT code?
- No. J9209 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.