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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. Clifford Zwillich:

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Specialties & Research

Dr. Clifford Zwillich, MD is board certified in Internal Medicine and Pulmonary Disease.

  • He has special expertise in 8 areas:
  • Apnea
  • Asthma
  • Hypoventilation
  • Myocardial Infarction
  • Obesity Hypoventilation Syndrome
  • Obstructive Lung Diseases
  • Sleep Apnea (Sleep Apnea Syndromes)
  • Stroke

Education & Awards

Dr. Zwillich graduated from University of Kansas , Kansas City. He has 2 awards.

One of America's Leading Experts on:
Obesity Hypoventilation Syndrome
Sleep Apnea Syndromes


Dr. Zwillich has 4 hospital affiliations:

  • University Hospital - Denver 
  • Veterans Affairs Eastern Colorado Health Care System 


  • English

> > > > Dr. Clifford Zwillich, MD

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Additional Information
Dr. Clifford Zwillich MD is a male Internist, has 45 years of experience and practices in Internal Medicine and Pulmonary Disease.
Where does Dr. Clifford Zwillich practice?
Dr. Clifford Zwillich has 1 office location.
Dr. Clifford Zwillich practices Internal Medicine and Pulmonary Disease near Denver, CO.
See Denver Internists and Denver Pulmonologists.