JohnOBrienMD

Family Medicine • O Fallon, MO

Physician

Join to view full profile

Dr. OBrien is on Doximity

As a Doximity member you'll join over two million verified healthcare professionals in a private, secure network.

Gain access to free telehealth tools, such as our “call shielding” and one-way patient texting.
Connect with colleagues in the same hospital or clinic.
Read the latest clinical news, personalized to your specialty.

See Dr. OBrien's full profile

Already have an account?

Office
2630 Highway K
O Fallon, MO 63368
Phone+1 636-240-5454

Fax+1 618-980-5335

Education & Training

National Capital ConsortiumFellowship, Gastroenterology, 1989 - 1991
Mercy Hospital (St Louis)Residency, Family Medicine, 1983 - 1986
University of Missouri-Columbia School of MedicineClass of 1983

Certifications & Licensure

MO State Medical License 1984 - 2026
IL State Medical License 1986 - 2005
MD State Medical License 1988 - 1991