My doctor performed a myomectomy during a c-section. I'm not sure if I should bill the myomectomy as 58140 w/ mod 52 and 59. 52 because incision had already been made for C-section. Or should I bill this w/ an unlisted code 59899? Also if I bill w/ code 58140 am I allowed to also bill out assistant surgeon fees on both the c-section and the myomectomy or just one? Help