Denial Pet Perfusion Scan-Modifier needed?

Hoping someone can assist with this. Florida Blue is denying claims with these codes billed stating a modifier is needed. These were performed in the office place of service and have always paid billed as is in the past. Anyone have any thoughts or suggestions?

A9555 2 units
J2785 4 units
78492 1 unit
93015 1 unit
78434 1 unit

Thank you!