Dr. Ketelaar graduated from University of Iowa Roy J & Lucille A Carver College of Medicine in 1979 and has been in practice for 39 years. He completed a residency at San Joaquin General Hospital. He currently practices at Michael T Ketelaar MD and is affiliated with Lodi Memorial Hospital. Dr. Ketelaar accepts multiple insurance plans including Medicare and PacifiCare (UnitedHealthcare).