A9540 HCPCS code: Technetium tc-99m macroaggregated albumin, diagnostic, per study dose, up to 10 millicuries
A9540 is the HCPCS Level II code for technetium tc-99m macroaggregated albumin, diagnostic, per study dose, up to 10 millicuries. In 2024 Medicare paid an average of $75.05 per service for A9540 across 1,383 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 2 per day on outpatient hospital claims. Medicare volume fell 3% from 2022 to 2024 (1,427 to 1,383 services). In 2024, about 328 clinicians billed Medicare for A9540 for 1,324 beneficiaries; Florida, Arizona, California accounted for 43% of services.
Code details
| Field | Value |
|---|---|
| Section | A codes — Transportation, medical/surgical supplies and miscellaneous |
| Coverage code | C — Carrier judgment |
| Pricing indicator | 57 |
| BETOS category | I1E |
| Added | 2006-01-01 |
| Last action effective | 2006-01-01 |
Who bills A9540 (2024)
| Measure | Value |
|---|---|
| Clinicians billing (by place of service) | 328 |
| Medicare beneficiaries | 1,324 |
| States with claims | 21 |
| Share of services in top 3 states (Florida, Arizona, California) | 43% |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for A9540, 2022–2024
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 1,427 | 1,372 | $98.31 | $78.28 |
| 2023 | 1,322 | 1,257 | $104.36 | $83.24 |
| 2024 | 1,383 | 1,324 | $94.21 | $75.05 |
States with the most A9540 services (2024)
| State | Services | Avg. paid |
|---|---|---|
| Florida | 228 | $117.03 |
| Arizona | 201 | $27.16 |
| California | 130 | $27.46 |
| Maryland | 129 | $50.32 |
| Texas | 94 | $147.17 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| outpatient hospital claims | 2 | Code Descriptor / CPT Instruction |
| practitioner claims | 2 | Code Descriptor / CPT Instruction |
What changed for A9540
- 2006-01-01: A9540 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 A9540?
A9540 is the HCPCS Level II code for technetium tc-99m macroaggregated albumin, diagnostic, per study dose, up to 10 millicuries. Short descriptor: "Tc99m maa".
How much does Medicare pay for A9540?
In 2024, the average Medicare payment was $75.05 per service (average allowed $94.21).
Does Medicare cover A9540?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
How many units of A9540 can be billed per day?
2 on outpatient hospital claims; 2 on practitioner claims (NCCI medically unlikely edits).
Related A95 codes
- A9500 — Technetium tc-99m sestamibi, diagnostic, per study dose
- A9501 — Technetium tc-99m teboroxime, diagnostic, per study dose
- A9502 — Technetium tc-99m tetrofosmin, diagnostic, per study dose
- 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
- A9505 — Thallium tl-201 thallous chloride, diagnostic, per millicurie
- A9506 — Graphite crucible for preparation of technetium tc 99m-labeled carbon aerosol, one crucible
- A9507 — Indium in-111 capromab pendetide, diagnostic, per study dose, up to 10 millicuries
- A9508 — Iodine i-131 iobenguane sulfate, diagnostic, per 0.5 millicurie
- A9509 — Iodine i-123 sodium iodide, diagnostic, per millicurie
- A9510 — Technetium tc-99m disofenin, diagnostic, per study dose, up to 15 millicuries
- A9512 — Technetium tc-99m pertechnetate, diagnostic, per millicurie
Building a device that would bill under a code like this? Caduvo matches a device description to HCPCS/CPT codes, Medicare coverage and payment, and the FDA pathway in one report.
Next steps
- Run a reimbursement report for a device billed under A9540
- Watch A9540 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A9540
Sources: CMS HCPCS Level II release October 2026; 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.