HCPCS Code A9585: Injection, gadobutrol, 0.1 mL

Each unit of A9585 represents 0.1 mL of gadobutrol. To calculate the billed units, multiply the total volume administered by 10. For example, if a patient receives 6.5 mL, you would bill 65 units. This aligns with the FDA-approved concentration and CMS billing standards.

According to CMS guidelines, use modifier JW when reporting discarded drug amounts from a single-use vial; list the wasted units on a separate claim line. Use modifier JZ when attesting that no residual drug was discarded, as required under CMS and certain payer rules.

Separate billing for A9585 is permitted by many Medicare MACs but may be bundled by some commercial payers into the global MRI procedure. Always confirm individual payer policies for reimbursement, required modifiers, and prior authorization rules to avoid denials.