can anyone comment on the way to correctly Medicare secondary for a consult with BCBS being primary?

Sure

Bill a consultation for Blue Cross then recode the visit to an appropriate level for Medicare (inpatient-3 choices of codes or outpatient-new/est- 9 choices of codes) and send the bill to them. Unfortunately you cannot crosswalk from a consult level x to Outpatient level x or y so technically you have to go to your chart and count bullets, etc. In reality I would say most are going to just guess.