Board certified family practice physician John Kratzer, DO joined Kosciusko Medical Group in 1991. Dr. Kratzer has practiced medicine since 1985 earning his medical degree from the University of Osteopathic Medicine and Health Sciences in 1983. He completed his internship in 1984 at Lansing General Hospital and a family practice residency at Botsford General Hospital in 1985. Dr. Kratzer is board certified through the American Osteopathic Board of Family Practice.