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. Gregory Felzien:
View the full profile to get information on:
- What's important to you
View full profile
be the first!
Specialties & Research
Dr. Gregory Felzien, MD is board certified in Internal Medicine and Infectious Disease.
Education & Awards
Dr. Felzien graduated from University of Colorado, Denver.