Wan In Koo, DO

Family Medicine

4.7 out of 5 –

SSM Health Medical Group

301 Caledonia Parkway, Suite 150 O Fallon, MO 63368

636-202-6802

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Dr. Koo is board certified in family medicine. She completed her internship at Deaconess Health System and completed her residency at Forest Park Hospital. Her medical degree was earned at Kirksville College of Osteopathic Medicine. Dr. Koo has a special medical interest in musculoskeletal injuries and preventative medicine.

About Me

Reviews

Rating Breakdown

Reviews are measured on a scale of 1 to 5, with 5 being the best score.

Question Breakdown
4.6
Overall Experience
4.7
Listened Carefully
4.8
Explained Things Clearly
4.7
Knew Medical History
4.7
Involved in Care Decisions
4.8
Showed Courtesy & Respect

Patient Reviews

SSM Health only displays patient satisfaction data for providers included in our survey process and who have a minimum of 30 returned surveys. The overall rating is an average of all responses to the survey questions listed below. The ratings and comments submitted by patients reflect their own views and opinions. Patient identities are withheld to ensure confidentiality and privacy. Learn more about our survey.

4.7 out of 5

93 ratings,

41 reviews

6/1/2026

She took time to get to know you. She really cares about you.

5/23/2026

Superb care

5/20/2026

Dr Koo listens, explains and empathize. She is an exceptional doctor.

5/20/2026

Very concerned

5/19/2026