Mercy Bariatric Center - O'Fallon

300 Winding Woods Drive
Suite 206
O Fallon, MO 63366
Fax: (636) 861-8866
Hours of Operation:
By appointment only. Please call to schedule.
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The reasons for weight-loss are more than cosmetic. People who are obese often experience serious health problems, such as heart disease and diabetes, and may be at increased risk for certain cancers.  Mercy Bariatric Center in O'Fallon, MO provides bariatric surgery that can help you successfully reach a healthier weight and reduce your risk of developing health complications associated with obesity.

In addition, surgical weight loss may also provide significant health benefits and allow you to:

  • Feel better
  • Have more energy
  • Reduce your cholesterol levels
  • Improve or resolve type 2 diabetes
  • Decrease your risk of heart disease, stroke, fatty liver disease, osteoarthritis and gastroesophageal reflux
  • Improve your breathing and mobility

What is Bariatric Surgery?

Bariatrics is simply the field of medicine focused on obesity, its causes, prevention and treatments. Bariatric surgery is divided into two different approaches to helping treat obesity: restrictive, where the stomach's size and capacity are reduced, and malabsorption, where the stomachs ability to absorb calories and nutrients is reduced.

At Mercy Bariatrics our team of leading experts is ready to help you meet your weight loss and health goals. We provide a variety of bariatric procedures including gastric sleeve, gastric banding and gastric bypass. In addition to your primary care physician, we call on our psychologists, dietitians, physical therapists, cardiologists, pulmonologists and surgeons to ensure your success. Bariatric surgery is just one part of your lifelong commitment to better health-but we're here to help.

Watch Our Online Seminar

Take the first steps to the new you.

Weigh Your Options

Discover the surgical options available to you.

Register for a Seminar

Get to know your care team. Register for an in-person seminar.

Patient Portal

Where patients can find the detailed information they need.

Download a Treatment Guide

Decide, along with our health care providers, if surgery is right for you.

Our Team Approach to Care

Watch a video to see how Mercy helps you make important lifestyle changes.

Am I Eligible for Bariatric Surgery?

Bariatric surgery is a great way to help build a healthy lifestyle, but it's not for everyone. For weight loss surgery to be a viable option, patients must meet the following criteria:

You're 100 pounds or more over your ideal weight and have one of the following conditions:

  1. A body mass index, or BMI, between 35 and 40, and
    • Diabetes
    • Sleep Apnea
    • High Blood Pressure
    • Your weight is causing health problems
  2. Or have a BMI of 40 or more and none of the above health conditions.

Calculate My BMI

Disclaimer: Surgery may be associated with its own set of problems, such as infection, poor wound healing, and rarely even death. Therefore, you and your surgeon should carefully discuss the risks of your current health condition compared to the risks and benefits of surgery.

I am Eligible

Learn more about additional requirements and the types of surgery at Mercy.

I am not Eligible

If you're not eligible for bariatric surgery, Mercy is still here to help. We have teams of weight loss specialists for non-surgical options as well.

Our Providers

Lisa Renae Martin Hawver, MD, Mercy
General Surgery, Bariatric Surgery
Mercy Clinic

Lisa Renae Martin Hawver, MD, FACS, is our Medical Director and our bariatric surgeon. She’s an experienced and board certified surgeon with specialties in bariatric and laparoscopic surgery.

After graduating and completing her surgeon residency at the University of Missouri - Kansas City, she moved to Virginia Commonwealth University for her fellowship in bariatric surgery. Before coming to Mercy, Dr. Hawver served as the Assistant Professor of surgery at the University of Cincinnati and the Medical Director of Bariatric Surgery at The Christ Hospital in Ohio.

Dr. Hawver is a "Surgeon of Excellence" in metabolic and bariatric surgery, according to the Surgical Review Corporation.

MBSQIP Metabolic Bariatric Surgery Accreditation and Quality Improvement Program

From left to right:Back row:Lindsay Branson, RN, MSN, Bariatric Program ManagerSheila Tidwell, Operations AssistantJillian Poretti, RD, Bariatric Center DieticianLeesa Benedict, Bariatric Clinical ReviewerFront row:Angela Chamberlin, RN, BSN, Bariatric Program CoordinatorDr. Lisa Martin-Hawver, MD, FACS, Medical Director of Bariatric SurgeryCarmen Schmaltz, RN, CBN, Bariatric Nurse Navigator

From left to right: Back row: Lindsay Branson, RN, MSN, Bariatric Program Manager Sheila Tidwell, Operations Assistant Jillian Poretti, RD, Bariatric Center Dietician Leesa Benedict, Bariatric Clinical Reviewer Front row: Angela Chamberlin, RN, BSN, Bariatric Program Coordinator Dr. Lisa Martin-Hawver, MD, FACS, Medical Director of Bariatric Surgery Carmen Schmaltz, RN, CBN, Bariatric Nurse Navigator

Bariatric Weight Loss Stories