Physician Assistants are mid-level medical providers that provide medical care in all areas of medicine.  PA's are trained in a master’s level program which normally last 28 months.  PA's see their own patients, write prescriptions and can perform procedures in the office such as biopsies and surgeries.  PAs always work as a part of the medical team with a physician, whereas nurse practitioners often work without a physician.  The quality of care provided by PAs and NPs can vary widely.  It is important to know the background and supervision of your health care provider.