Assistant Professor
13 years of experience
Accepting new patients
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. William Janssen, MD is board certified in Critical Care Medicine and Pulmonary Disease.

  • He has special expertise in 5 areas:
  • Asthma
  • Chronic Obstructive Pulmonary Disease (COPD)
  • Dyspnea
  • Inflammation
  • Sepsis (Blood Poisoning)

Education & Awards

Dr. Janssen graduated from The Ohio State University , Columbus.


Dr. Janssen has 10 hospital affiliations:

  • Swedish Medical Center 
  • Denver Health Medical Center 


  • English

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Additional Information
Dr. William J Janssen MD is a male Internist, has 13 years of experience and practices in Internal Medicine, Critical Care Medicine, and Pulmonary Disease.
Where does Dr. William J. Janssen practice?
Dr. William Janssen has 5 office locations.
Dr. William Janssen practices Internal Medicine, Critical Care Medicine, and Pulmonary Disease near Aurora, CO.
Additional practice locations include: Englewood, CO and Denver, CO.
See Aurora Internists, Aurora Critical Care Practitioners, and Aurora Pulmonologists.