The Physician Assistant Medical Specialty is a licensed, certified, non-physician healthcare provider. They provide direct patient care and have prescriptive authority. They are credentialed, privileged, and billed as independent providers by Medicare and Medicaid. The Advanced Practice Provider offers medical care based on the supervising physician's scope of practice. These providers work in specialty clinics. They may specialize in Palliative Care, Pulmonary, Infectious Disease, Endocrinology, Gastroenterology, Cardiology, Dermatology, Urology, Nephrology, Neurology, Hematology, Oncology, Allergy and Immunology, Rheumatology, or other specialties.