HCPCS code A9521 — Tc99m exametazime.
Status: Active.
Effective Jan 1, 2025.
Source: CMS HCPCS Level II.
A9521
ActiveTc99m exametazime
Technetium tc-99m exametazime, diagnostic, per study dose, up to 25 millicuries
Category:
Transportation & Supplies
Section:
A-codes: Transportation, Medical & Surgical Supplies
Effective:
Jan 1, 2025
Code type:
alphanumeric
OPPS Status:
E1
— Items / services not paid by Medicare
MUE — Medically Unlikely Edits
Maximum units of A9521 Medicare will pay for one beneficiary on one date of service. Claims exceeding the MUE are denied or returned for review.
| Service Type | Max Units / Day |
|---|---|
| Outpatient Hospital | 2 |
| Practitioner Services | 2 |
Source: CMS Medicare NCCI Medically Unlikely Edits
NCCI Edits
The following codes cannot be billed together with A9521 without appropriate documentation.
| Column 2 Code | Modifier |
|---|---|
| A9512 | Modifier cannot bypass edit |
Source: CMS National Correct Coding Initiative (NCCI)
Change History
Quarterly changes published by CMS. Revisions may affect the code description, coverage, or rate — review each quarter's changes before submitting claims.
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New Code 2025-Q1Tc99m exametazime