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About Mercy

Mercy Sleep Medicine Team

Mercy Sleep Center has a team of four experienced physicians, board-certified in sleep medicine and one physician’s assistant.  In addition to the physicians, an extensive staff of sleep techs and nurses ensure that each patient receives individualized and comprehensive diagnosis, treatment and follow-up care.

Mercy Sleep Center medical staff currently includes:

Melisa Coaker, M.D., M.D., DABSN

Melisa A. Coaker, MA, MD was born and raised in the suburbs of Detroit, Michigan. She completed undergraduate and graduate training at Wayne State University in Detroit. She completed medical school at Meharry Medical College in Nashville, Tennessee, and finished her internal medicine residency and sleep medicine fellowship at Henry Ford Hospital in Detroit. Her special interests include sleep disordered breathing and shift work disorder, both of which were the basis for her fellowship research. She is board certified in internal medicine and sleep medicine. Melisa and her husband reside in Des Moines.

Donald Burrows, M.D.

Mercy Sleep Center medical director

Donald L. Burrows, M.D., was born in Chicago and moved to Des Moines in 1984. He attended the University of Michigan at Ann Arbor as an undergraduate and the University of Illinois in Chicago for his medical degree. He completed his internal medicine residency and his critical care fellowship at the University of Illinois. Dr. Burrows spent the last year of his fellowship researching sleep apnea. He is board-certified in internal medicine, pulmonary and sleep medicine. Dr. Burrows is medical director of the Mercy Sleep Center. His interests are sleep disorders and critical care medicine.

Wendy Fluegel, M.D.

Wendy L. Fluegel, M.D., born and raised in central Missouri, attended school at the University of Missouri, Kansas City. She subsequently received training in internal medicine, pulmonary, critical care and sleep medicine at the University of Minnesota in Minneapolis. She was chief resident in internal medicine. Dr. Fluegel was an associate professor at the University of Missouri, Kansas City, in conjunction with private practice from 1995 to 1998. Research interests include alternative treatment options for obstructive sleep apnea and asthma treatment and outcome. She continues to be interested in all aspects of sleep medicine and pulmonary disorders. She is board-certified in internal medicine, pulmonary and sleep medicine with board eligibility in critical care medicine.

Roger Liu, M.D.

Roger T. Liu, M.D., was born in Korea, graduated from the Korea University Medical College in 1971 and came to the United States in 1972. He completed a pulmonary diseases fellowship at Rutgers Medical School in New Brunswick, NJ, in 1978. His interests are clinical pulmonary diseases, pulmonary physiology and sleep disorders. He is board-certified in internal medicine, pulmonary disease and sleep medicine.

Nguyen-Ly Vo, PA-C

Nguyen-Ly Vo, PA-C, was born in Vietnam and came to the United States with her family in 1993. They first lived in Maine, and in 1995, they relocated to Mt. Pleasant, Iowa where she completed her secondary education. Nguyen-Ly received her Bachelor of Business Administration in Management Information Systems from the University of Iowa in Iowa City, IA, and her Bachelor of Science in Physician Assistant Studies from Long Island University in Brooklyn, NY. She is certified by the National Commission on Certification of Physician Assistants and licensed by the state of Iowa. Her newly found interest is sleep medicine.

Harry Yuan, D.O.

Harry Yuan, D.O., is the only pediatric sleep specialist in Iowa. He completed his pediatric pulmonology fellowship at Children’s Hospital Los Angeles and his pediatric residency at Children’s Hospital of Michigan. Dr. Yuan offers specialized care for sleep apnea and other sleep disorders in addition to pulmonary care for pediatric patients of all ages. He is board certified in pediatrics, pediatric pulmonology and board eligible in sleep medicine.

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