While certain insurances companies will only board certified physicians to do a specific procedure (ie bill a specific cpt code ), straight Medicare and most of the managed cares will allow any physician (regardless of specialty and board status ) to use various billing codes . Hence if you have the ability to read PSG (honestly how hard is it for OSA ) , write a report and bill the code , then you can probably get paid for it . If you enter pure private practice and you see the boss (or your family or friends are the boss and give you leeway), then your plan seems sound enough . Just note not all insurances will allow payment if not board certified in sleep. But this varies and you willl have to check out each insurance .
Now if the PP partner is sleep certified , then go ahead and write the report and bill under that doctors name if the other doctor permits .
The only issue at hand with doing something non BC is if a lawsuit comes around . The lawyers will have plenty of ammunition . Moreover , your malpractice premiums will not cover that if not BC . Just a thought .