Per CPT book
"The surgical microscopy is employed when the surgical services are performed using the techniques of microsurgery. Code 69990 should be reported (without modifier 51) in addition to the code for the primary procedure performed. DO NOT use 69990 for visualization with magnifying loupes or corrected vision.
DO NOT report 69990 in addition to procedures where use of the operating microscope is an inclusive component (15756-15758, 15842, 19364, 19368, 20955-20962, 20969-20973, 22856-22861, 26551-26554, 26556, 31526, 31531, 31536, 31541, 31545, 31546, 31561, 31571, 43116, 43496, 49906, 61548, 63075-63078, 64727, 64820-64823, 65091-68850, 0184T)"
CMS does bundle 69990 in 69631 and 69436 and not allowed to break out.