Mercy Clinic Family Medicine - O'Fallon

300 Winding Woods Drive
Suite 222
O Fallon, MO 63366
Fax: (636) 978-8602
Hours of Operation:
Monday-Friday: 8 a.m. - 4:45 p.m.

You don’t often think about your doctor until you get sick. Our team of primary care physicians want to change that. Being well between visits is just as important. So Mercy Clinic Family Medicine - O'Fallon focuses on health education and answering your health care questions and concerns, enabling you to take an active part in your health care. And our team is also linked to numerous medical specialists and a full range of diagnostic laboratory and imaging services when you need them.

Mercy doctors are connected by our advanced electronic health record system, so your most up-to-date medical information is instantly available to the caregivers at each point of medical care.  In addition, you can take advantage of MyMercy, an online service to view test results, make appointments, and send secure messages to your doctor and more - anytime and anywhere.

Services Offered

Our Providers

Matthew A. Beckerdite, MD, Family Medicine, Mercy
Family Medicine
Mercy Clinic
 | Offers E-Visits
What is an E-Visit?
Christopher F. Blanner, MD, Family Medicine, Mercy
Family Medicine
Mercy Clinic
Alyssa Leigh Keller, MD, Family Medicine, Mercy
Family Medicine
Mercy Clinic
 | Offers E-Visits
What is an E-Visit?
Sondra K. McClanahan, FNP, Family Medicine, Mercy
Family Medicine
Mercy Clinic
 | Offers E-Visits
What is an E-Visit?
Stephanie Marie Orlando, NP, Family Medicine, Mercy
Family Medicine
Mercy Clinic
 | Offers E-Visits
What is an E-Visit?