About
Dr. Leo Toupin is a board-certified internist and sleep medicine specialist practicing in northwest Austin. He earned his Bachelor of Science in Biology from Indiana University, Bloomington in 1986, then his Doctorate of Medicine from Indiana University School of Medicine in 1990. He completed both his internship and internal medicine residency at the University of California San Diego Medical Center, finishing in 1993.
Dr. Toupin holds dual board certifications through the American Board of Internal Medicine, covering both internal medicine and sleep medicine. He serves as Adjunct Clinical Assistant Professor of Internal Medicine at Touro University Nevada, College of Osteopathic Medicine. Castle Connolly recognized him as a Top Doctor every year from 2012 through 2024. He received the Upjohn Achievement Award in 1990, the James Y. McCullough Fellowship in 1989, and the Merck Manual Award in 1988. Dr. Toupin belongs to the American College of Physicians, the American Academy of Sleep Medicine, and the American Institute of Ultrasound in Medicine, among other professional societies. His clinical interests span multiple chronic conditions, disease prevention, and identifying opportunities to improve each patient's overall health.
Education & Training
Undergraduate
Indiana University, Bloomington, IN — Bachelor of Science, Biology 1986
Medical School
Indiana University School of Medicine, Indianapolis, IN — Doctorate of Medicine 1990
Residency
Internal Medicine, University of California San Diego Medical Center, San Diego, CA 1991-1993
Additional Training
Internship, University of California San Diego Medical Center, San Diego, CA 1990-1991; Adjunct Clinical Assistant Professor Internal Medicine, Touro University Nevada, College of Osteopathic Medicine
Certifications
Conditions Treated
Who is Dr. Toupin right for?
Dr. Toupin is a strong fit for adults seeking proactive, relationship-driven primary care. Patients managing diabetes, hypertension, or sleep disorders benefit directly from his dual-board expertise. He also serves adults who want comprehensive preventive screenings and a physician who tracks their health over the long term. Patients who value hospital continuity will appreciate that Dr. Toupin supports their care if they are ever admitted to a local hospital.
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Frequently Asked Questions
Dr. Toupin specializes in internal medicine and sleep medicine. He treats chronic conditions including diabetes and hypertension, and he manages sleep disorders with particular depth of experience. He also addresses acute illnesses and injuries and conducts preventive screenings for adult patients.
Yes. Dr. Toupin holds board certifications from the American Board of Internal Medicine in both internal medicine and sleep medicine. He has maintained these certifications throughout his career.
Dr. Toupin earned his medical degree from Indiana University School of Medicine in 1990. He then completed both his internship and his internal medicine residency at the University of California San Diego Medical Center, finishing his residency in 1993.
Yes. Dr. Toupin serves as Adjunct Clinical Assistant Professor of Internal Medicine at Touro University Nevada, College of Osteopathic Medicine. This role reflects his ongoing involvement in medical education alongside his clinical practice.
Castle Connolly named Dr. Toupin a Top Doctor every year from 2012 through 2024. Earlier in his career, he received the Upjohn Achievement Award in 1990, the James Y. McCullough Fellowship in 1989, and the Merck Manual Award in 1988.
Dr. Toupin focuses on understanding each patient as a whole rather than treating conditions in isolation. He believes preventive maintenance and early attention to warning signs form the foundation of long-term health. His goal is to help patients reach and sustain health goals that fit their individual lifestyle.
Yes. Dr. Toupin maintains affiliations with St. David's North Austin Medical Center, Seton Northwest Hospital, and Seton Medical Center Austin. He actively supports patients through any hospitalizations at these facilities.
Dr. Toupin is a member of the American College of Physicians, the American Academy of Sleep Medicine, the American Institute of Ultrasound in Medicine, the Texas Medical Association, and the Travis County Medical Society. He also holds membership in the academic honor societies Alpha Omega Alpha and Phi Beta Kappa.
Doctor profile last updated June 6, 2026