A9546 HCPCS code: Cobalt co-57/58, cyanocobalamin, diagnostic, per study dose, up to 1 microcurie
A9546 is the HCPCS Level II code for cobalt co-57/58, cyanocobalamin, diagnostic, per study dose, up to 1 microcurie. In 2022 Medicare paid an average of $9.93 per service for A9546 across 16 services. Its Medicare coverage code is C (Carrier judgment): Coverage is decided by the Medicare contractor (MAC) case by case. The NCCI unit limit is 1 per day on outpatient hospital claims. In 2022, about 2 clinicians billed Medicare for A9546 for 11 beneficiaries.
Code details
| Field | Value |
|---|---|
| Section | A codes — Transportation, medical/surgical supplies and miscellaneous |
| Coverage code | C — Carrier judgment |
| Pricing indicator | 53 |
| BETOS category | I1E |
| Added | 2006-01-01 |
| Last action effective | 2006-01-01 |
Who bills A9546 (2022)
| Measure | Value |
|---|---|
| Clinicians billing (by place of service) | 2 |
| Medicare beneficiaries | 11 |
| States with claims | 1 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for A9546, 2022–2022
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 16 | 11 | $12.43 | $9.93 |
States with the most A9546 services (2022)
| State | Services | Avg. paid |
|---|---|---|
| New Jersey | 16 | $9.93 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| outpatient hospital claims | 1 | Code Descriptor / CPT Instruction |
| practitioner claims | 1 | Code Descriptor / CPT Instruction |
What changed for A9546
- 2006-01-01: A9546 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 A9546?
A9546 is the HCPCS Level II code for cobalt co-57/58, cyanocobalamin, diagnostic, per study dose, up to 1 microcurie. Short descriptor: "Co57/58".
How much does Medicare pay for A9546?
In 2022, the average Medicare payment was $9.93 per service (average allowed $12.43).
Does Medicare cover A9546?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
How many units of A9546 can be billed per day?
1 on outpatient hospital claims; 1 on practitioner claims (NCCI medically unlikely edits).
Related A95 codes
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- A9503 — Technetium tc-99m medronate, diagnostic, per study dose, up to 30 millicuries
- A9504 — Technetium tc-99m apcitide, diagnostic, per study dose, up to 20 millicuries
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- A9507 — Indium in-111 capromab pendetide, diagnostic, per study dose, up to 10 millicuries
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- A9512 — Technetium tc-99m pertechnetate, diagnostic, per millicurie
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Next steps
- Run a reimbursement report for a device billed under A9546
- Watch A9546 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A9546
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.