2. CRNAs can be "medically directed" at a maximum number of 1:4, however an MD can "medically supervise" at a ratio higher than that, they just cannot bill for medical direction. Makes sense, right?
4.
In states that haven't opted out CRNAs are required to be "supervised" by a physician to bill medicare however in many rural settings that supervision is satisfied by the surgeon (or ER doctor, hospitalist, ect) signing the chart as the supervising physician. So essentially CRNAs in these non opt out state settings practice anesthesia independently already with the chart signing being little more than a formality. No hospital would put up with an anesthesia department that cannot bill for medicare cases so if they have a CRNA only department they will either pressure the surgeon into signing the chart or hire an Anesthesiologist to supervise the anesthetists.