Technical component of office echo

How do you figure out the technical component of an echo done in the office? The new code is 93306 (professional and technical). Is there a formula or do you figure your own formula?

93306

Hospitals should use CPT code 93306 to report the performance of a resting TTE (CPT 93307) with spectral and color Doppler ((93320 and 93325, respectively). The charge for CPT 93306 should ideally be the sum of current hospital charges for CPT 93307, CPT 93320 and CPT 93325.(Technical component)