Dr. Deffer graduated from Texas Tech University Health Sciences Center School of Medicine in 1986 and has been in practice for 32 years. He completed a residency at United States Army Medical Center. Dr. Deffer also specializes in Hand Surgery. He currently practices at North West Iowa Bone Joint & Sport Surgeons and is affiliated with Spencer Hospital. Dr. Deffer accepts multiple insurance plans including Aetna, Wellmark and Medicare.