A primary care physician, or PCP, is a physician who provies both the first contact for a person with an undiagnosed health concern as well as continuing care of varied medical conditions, not limited by cause, organ system, or diagnosis. A PCP generally does not specialize in any medical specialty, such as neurology, cardiology, or pulmonology, nor perform surgery. The term "PCP" is most commonly used in the United States. A primary care physician can be described by training, skill and scope of practice, role in the health care system, and the usual setting in which care is delivered. Primary care physicians are declining in numbers in many developed countries.