Dr. Koga was born and raised in the Boise area. He graduated from Willamette University with a bachelor’s degree in biology. He received his master’s degree in genetics from Washington State University and his medical degree from Southwestern Medical School. Dr. Koga did his internship, residency, and was chief resident at Providence Medical Center. Dr. Koga has been practicing medicine in Caldwell since 1995.

Dr. Koga and his wife, Ann, have two children, Dailey and Duncan. He and his family are very active in athletics and it is not uncommon to see them on the soccer field, football field, basketball court, baseball field or in the swimming pool.


Medical School
Southwestern Medical School

Providence Medical Center

Certifications & Memberships

American Board of Internal Medicine



Languages Spoken



Internal Medicine

Office Locations

West Valley Medical Group, LLC
1906 Fairview Ave
Suite 230
Caldwell, ID 83605
Phone: (208) 459-4667
Fax: (208) 459-3372