HCPCS drug code · CMS crosswalk
Zynlonta J-Code / HCPCS Code
In short
Zynlonta is billed under HCPCS J9359 — Injection, loncastuximab tesirine-lpyl, 0.075 mg. One billing unit is 0.075 mg. CMS's crosswalk lists 1 Zynlonta NDC under this code.
Reference
- J9359
- Injection, loncastuximab tesirine-lpyl, 0.075 mgBilling unit: 0.075 mg
- Labelers
- ADC Therapeutics America, Inc.
Medicare Part B payment limit
CMS ASP filePayment limit per unit$226.565
Per0.075 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
Zynlonta units and claim line
Enter the dose given to get the J9359 units and the NDC line for the CMS-1500 and the 837P.
Enter the dose given to build the claim line.
Zynlonta 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 |
|---|---|---|---|---|
| 79952-0110-01 | J9359 | ADC Therapeutics America, Inc. | 1 | 134 |
Zynlonta: common questions
- What is the J-code for Zynlonta?
- Zynlonta is billed under HCPCS J9359 — Injection, loncastuximab tesirine-lpyl, 0.075 mg. One billing unit is 0.075 mg. CMS's crosswalk lists 1 Zynlonta NDC under this code.
- How many J9359 billing units are in a package of Zynlonta?
- CMS lists 134 billing units per package, depending on the NDC, where one unit is 0.075 mg. Units to report are based on the dose given, not the package.
- Is J9359 a CPT code?
- No. J9359 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.