The existing CPT codes (roughly) pay proportionately to physician time (RVUs). So I wouldn't say there's an an incentive toward delivering care efficiently, but rather hospital management wants to maximize billable hours.
For hospital stays, I may be outdated in this, but Medicare pays a lump sum DRG which doesn't tend to go up much, so the longer the patient is in the hospital, the less money the hospital makes.
Short story is the biggest pressures from the higher-ups is for us to see more volume outpatient, and cut duration of stays inpatient....