C9304 HCPCS code: Injection, marstacimab-hncq, 0.5 mg
C9304 is the HCPCS Level II code for injection, marstacimab-hncq, 0.5 mg. CMS terminated C9304 on 2025-06-30; do not bill it for later dates of service. Its Medicare coverage code is D (Special coverage instructions apply): Medicare covers it when its national or local coverage criteria are met.
Code details
| Field | Value |
|---|---|
| Section | C codes — Outpatient PPS (hospital outpatient temporary codes) |
| Coverage code | D — Special coverage instructions apply |
| Pricing indicator | 53 |
| BETOS category | O1E — Other drugs |
| Added | 2025-04-01 |
| Last action effective | 2025-07-01 |
| Terminated | 2025-06-30 |
What changed for C9304
- April 2025: Code appears in this HCPCS release
- 2025-04-01: C9304 added to HCPCS Level II
- Next scheduled CMS quarterly update (HCPCS and DMEPOS fee schedule): 2027-01-01
Frequently asked questions
What is HCPCS code C9304?
C9304 is the HCPCS Level II code for injection, marstacimab-hncq, 0.5 mg. Short descriptor: "Inj marstacimab, 0.5 mg".
Does Medicare cover C9304?
Coverage code D — Special coverage instructions apply. Medicare covers it when its national or local coverage criteria are met.
Related C93 codes
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Next steps
- Run a reimbursement report for a device billed under C9304
- Watch C9304 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for C9304
Sources: CMS HCPCS Level II release October 2025; CMS DMEPOS fee schedule; CMS NCCI MUE tables; CMS Medicare utilization (physician and DME supplier files); CMS Medicare Coverage Database articles. Fees are Medicare allowables, not commercial rates. Not billing or legal advice.