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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).

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Specialties & Research

Dr. Richard Leff, MD is board certified in Internal Medicine and Rheumatology.

  • He has special expertise in 2 areas:
  • Dermatomyositis
  • Rheumatic Diseases

Education & Awards

Dr. Leff graduated from Yale University, New Haven.


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Additional Information
Dr. Richard Louis Leff MD is a male Internist, has 26 years of experience and practices in Internal Medicine and Rheumatology.
Where does Dr. Richard L. Leff practice?
Dr. Richard Leff has 2 office locations.
Dr. Richard Leff practices Internal Medicine and Rheumatology near Chadds Ford, PA.
Additional practice locations include: Wilmington, DE.
See Chadds Ford Internists and Chadds Ford Rheumatologists.