Exp Prob Focus vs Detailed exam
You really need to question your carriers. As for Medicare CMS has left this up to the contracted mac's to determine.
Highmark Medicare Services (soon to be "Novitas Solutions, Inc") has a 4X4 rule, however keeping in mind clinical judgement may override this ruling.
I believe Trailblazer is 2-4 exp prob focus and 5-7 detail.
keep in mind although they require the same number of body areas/organ systems, if selecting detailed one of those two systems should detailed in nature.
Hope this helps.
Cheryl