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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. Gregory Keelen:

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Specialties & Research

Dr. Gregory Keelen, DO is board certified in Emergency Medicine.

Education & Awards

Dr. Keelen graduated from Kansas City University of Medicine.


Dr. Keelen has 6 hospital affiliations:

  • Texoma Medical Center 
  • Methodist Dallas Medical Center 

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Additional Information
Dr. Gregory Martin Keelen DO is a male Emergency Medicine Specialist, has 9 years of experience and practices in Emergency Medicine.
Where does Dr. Gregory M. Keelen practice?
Dr. Gregory Keelen has 1 office location.
Dr. Gregory Keelen practices Emergency Medicine near Dallas, TX.
See Dallas Emergency Physicians.