Which Medicare plan pays for doctor's services—Part A or Part B?

The duties of a primary care physician (PCP) in a health maintenance organization (HMO) include:

A. acting as a gatekeeper to services. B. coordinating patient care. C. referring patients to specialists. D. all of the above.

A preexisting condition that, because of its effect on the principal diagnosis, results in more intensive therapy or a longer stay is a(n):

chronic condition. complication. comorbidity. exacerbation.