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Mark E. Lassise, MD

Mark E. Lassise, MD


Dr. Mark E. Lassise is board-certified in psychiatry and neurology, with additional qualifications in addiction medicine, and has treated patients at Mason City Clinic since 1997. With over 25 years of practice experience and extensive training, Dr. Lassise provides patients with state-of-the-art care for a wide range of conditions.

Dr. Lassise graduated with a bachelor’s degree in science from the University of Montana, followed by his medical degree from the University of Colorado College of Medicine. He then completed residency training in psychiatry at Mayo Graduate School of Medicine.

In addition to his duties within our clinic, Dr. Lassise also serves as a consulting psychiatrist at Mercy Medical Center-North Iowa, medical director of Mental Health Services at Mercy Medical Center North Iowa and medical director of Senior Life Solutions at Hancock County Memorial Hospital in Britt. He is part of the teaching faculty of the Family Practice Residency Program at the University of Iowa and Des Moines University College of Osteopathic Medicine. Dr. Lassise remains active in several professional organizations, including:

  • American Psychiatric Association
  • American Association for Geriatric Psychiatry
  • American Society of Addiction Medicine
  • American College of Forensic Examiners, Diplomate
  • Iowa Psychiatric Society
  • Iowa Medical Society
  • Cerro Gordo Medical Society
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