SSM Health Medical Group
Wan In Koo, DO Family Medicine in O Fallon, MO
SSM Health Medical Group
301 Caledonia Parkway, Suite 150 O Fallon, MO 63368
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
Specialties
Family Medicine
Gender
Female
Education
Forest Park Hospital/Deaconess
Internship, 2000
Forest Park Hospital/Deaconess
Residency, 2002
A.T. Still University (Kirksville College Osteopathic Med)
Medical School, 1998
Hospital Affiliations
SSM Health DePaul Hospital - St. Louis
SSM Health St. Joseph Hospital - Lake Saint Louis
SSM Health St. Joseph Hospital - St. Charles
Certifications
American Board of Family Medicine
Drug Enforcement Administration
Missouri State Board of Registration
Medical Interests
Acute care
Osteopathic medicine
Preventive care
Primary care
Reviews
Rating Breakdown
Reviews are measured on a scale of 1 to 5, with 5 being the best score.
Question Breakdown
4.5Overall Experience4.6Listened Carefully4.7Explained Things Clearly4.7Knew Medical History4.7Involved in Care Decisions4.8Showed 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.
4.6 out of 5
94 ratings,
44 reviews
10/16/2026
She’s very no nonsense which I typically like, but I feel rushed every time that I’m in there and she mentioned two things of concern right at the start of the appointment but then we never got back to the two things that were brought up
10/15/2026
Dr. Koo, thank you for being my doctor and thank you to your staff for always making me feel like I matter!! You all are amazing!!
10/12/2026
Dr Koo is an excellent physician, and I use SSM health services because of her.
9/29/2026
She was nice and doing her job well.
9/19/2026
No stone unturned, if you got something she will find it
Map & Directions
SSM Health Medical Group
301 Caledonia Parkway, Suite 150 O Fallon, MO 63368
Mon
7:30 am - 5:00 pm
Tue
7:30 am - 5:00 pm
Wed
7:30 am - 5:00 pm
Thu
7:30 am - 5:00 pm
Fri
7:30 am - 5:00 pm
Sat
Closed
Sun
Closed
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