Mark S. Fixley, M.D.

Mark S. Fixley, M.D.

4050 W. Memorial Rd
Oklahoma City, OK 73120
Critical Care Medicine
Pulmonary Medicine
My Mid-Level Providers 

Professional Information

  • Dr. Fixley has a special interest in sleep medicine and its application and association with congestive heart failure and coronary artery disease. He also has a special interest in Intensive Care Medicine. He was an assistant professor at the Kansas Medical Center from 1977-1980. He is also an Associate Clinical Professor of Medicine, Oklahoma City Health Sciences Center from 1981 to present. He serves as the Medical Director of Sleep Clinic Respiratory Therapy at Oklahoma Heart Hospital.

Professional Societies

  • Oklahoma Medical Association
  • American Medical Association
  • American Thoracic Society
  • American College of Physicians
  • American College of Chest Physician
  • American Society of Critical Care Medicine
  • American Association of Sleep Medicine


  • Pulmonary Disease, University of Kansas Medical Center and McGill University, Montreal, Canada

Postgraduate Training

  • University of Kansas Medical Center, Lawrence, Kansas

Medical School

  • University of Kansas, Lawrence, Kansas

Specialty Certification

  • American Board of Internal Medicine
  • American Board of Internal Medicine - Pulmonary Medicine
  • American Board of Internal Medicine - Critical Care Medicine
Call for Appointment 
(405) 608-3800
Personal Information 

Dr. Fixley enjoys fly fishing and hunting in his spare time.