Correct coding guidelines require that modifier -26 be used when the professional component of a global service is the only service provided (i.e. supervision and/or interpretation codes.)
HCPCS Level II modifier -TC represents the technical component of a service or procedure and includes the cost of equipment and supplies to perform that service or procedure. This modifier corresponds to the equipment/facility part of a given service or procedure.
Correct coding guidelines require that modifier -TC be used when the service provided represents only the equipment or facility component of a global service and not the professional component of the same service. Hospitals frequently provide only the technical component of some services. Hospitals are not currently required to submit the -TC modifier, but will be reimbursed as if the -TC had been billed.