Any medical professional (physician, nurse practitioner, etc.) or institution (hospital, clinic, etc.) that provides medical care.
nurse (nurs)
A health professional trained to care for people who are ill or disabled.
Source: The National Cancer Institute's Dictionary of Cancer Terms
(http://www.cancer.gov/dictionary)
practitioner (prak-TIH-shuh-ner)
A person who works in a specific profession. For example, a doctor or nurse is a healthcare practitioner.
Source: The National Cancer Institute's Dictionary of Cancer Terms
(http://www.cancer.gov/dictionary)