Hello. What codes would you use to code for the use of SPY, the series of injections to administer the flourescent agent, and the imaging and interpretation of images taken during the procedure?

I have seen CPT codes 15860 (intravenous injection of agent (e.g. fluroscein) to test vascular flow in flap or graft) and 76499 (for radigraphic procedure) reported. Is this correct? Also, would you increase the units for CPT 15860 if there is more than one injection?

My surgeons are using SPY to test tissue perfusion duing microsurgery, reconstructive surgery and plastic surgery however I am unsure as to how to capture all that is being done.

Thank you