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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 Marsh:

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Specialties & Research

Dr. William Marsh, MD is board certified in Allergy & Immunology and Pediatrics.

  • He has special expertise in 3 areas:
  • Asthma
  • Hay Fever (Seasonal Allergic Rhinitis)
  • Nasal Allergy (Rhinitis)

Education & Awards

Dr. Marsh graduated from The University of Texas at San Antonio.


Dr. Marsh has 4 hospital affiliations:

  • Exempla Inc Saint Joseph Hospital 
  • Exempla Good Samaritan Medical Center 

> > > > Dr. William Marsh, MD

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Additional Information
Dr. William Robert Marsh MD is a male Allergist & Immunologist, has 33 years of experience and practices in Allergy & Immunology and Pediatrics.
Where does Dr. William R. Marsh practice?
Dr. William Marsh has 1 office location.
Dr. William Marsh practices Allergy & Immunology and Pediatrics near Denver, CO.
See Denver Allergists and Denver Pediatricians.