Global billing is when the physician/practitioner bills for both the TC and PC of a test. The physician/practitioner may bill globally when he performs the test and interpretation. The appropriate procedure code for the diagnostic test should be reported without the 26 or TC modifiers.
If the multiple procedure reduction and/or OPPS cap applies to the TC of the service, there is no need to split bill. Any applicable reductions/caps to the TC will be calculated with the allowed amount for the global service.