One way to answer this question is to look in the index of the CPT Professional Edition under the main heading of Tumor.

This question represents a subsequent tap. The code 61000 is reported for an initial procedure. Modifier -50 is not necessary because it is inherently included in the code description

One way to find this answer is in the index of the CPT Professional Edition under Fenestration Procedure, Revision. You would attach modifier -50 to indicate a bilateral procedure

The note under Prophylaxis indicate that these services are repetitive, performed in multiple sessions, and are intended to include all services in a defined treatment period. The parenthetical note under code 67229 states to use modifier -50 for a bilateral procedure. The operating microscope is bundled into this procedure. Refer to code 69990 for a list of bundled codes.

The professional services for the CT should have a modifier -26. The professional service is the procedure; therefore, there would be no modifier -26 on code 60300