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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. William Loos:

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Specialties & Research

Dr. William Loos, MD is board certified in Internal Medicine.


Education & Awards

Dr. Loos graduated from University of Washington, Seattle.


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Additional Information
Dr. William Fred Loos MD is a male Internist, has 34 years of experience and practices in Internal Medicine.
Where does Dr. William F. Loos practice?
Dr. William Loos has 2 office locations.
Dr. William Loos practices Internal Medicine near Sylmar, CA.
See Sylmar Internists.