The physician who is primarily responsible for a patient's care ...

[abern]

The physician who is primarily responsible for a patient's care while in the hospital is referred to as the:
 
  admitting physician.
 
  attending physician.
 
  rendering physician.
 
  primary care physician.

Question 2

The list of Ambulatory Payment Classification (APC) rates is maintained by:
 
  the American Medical Association (AMA).
 
  the Blue Cross/Blue Shield Association.
 
  the Centers for Medicare and Medicaid Services (CMS).
 
  contracted health plans.

[vseab]

Answer to Question 1

Answer: attending physician.

Answer to Question 2

Answer: the Centers for Medicare and Medicaid Services (CMS).