Millicuries won't dictate units anymore. • 2009: A9500 -- Technetium Tc-99m sestamibi, diagnostic, per study dose, up to 40 millicuries • 2010: A9500 -- Technetium Tc-99m sestamibi, diagnostic, per study dose. But as in 2009, verify with your payer what it considers to be a "study." Typically, you should be able to report one dose for a test's rest phase and one dose for the stress phase, but a few payers may consider the two phases to be a single study. Resource: