The 20 Best Diarrhea Doctors Near Me in Saint Peters, MO

Find the Top Diarrhea Experts and Specialists

Last Updated: 04/28/2026

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MediFind found 128 doctor with experience in Diarrhea near Saint Peters, MO. Of these, 120 are Experienced, 6 are Advanced and 1 are Distinguished.

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128 providers found
    Michael Hemmersmeier
    Experienced in Diarrhea
    Family Medicine
    Experienced in Diarrhea
    Family Medicine

    SSM Health Medical Group

    1101 Highway K, 
    O Fallon, MO 
     (3.8 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Dr. Hemmersmeier is board certified in family medicine. He completed his residency at Deaconess Hospital - St. Louis after earning his medical degree at Kirksville College of Osteopathic Medicine. Dr. Hemmersmeier has been in practice in O'Fallon, MO since 1998. He has a special interest in sports medicine and has volunteered as a coach in the community and at his church in conjunction with his children's athletic interests. Dr. Hemmersmeier has been awarded recognition from the National Committee for Quality Assurance (NCQA) Diabetes and Stroke Physician Recognition Programs for meeting national standards for diabetes and stroke care. Dr. Hemmersmeier is part of a Patient-Centered Medical Home. Dr. Hemmersmeier uses telehealth services to conduct video office visits with current, established patients for: upper respiratory infection, sore throat, cough, seasonal allergies, skin rashes or lesions, mouth and cold sores, flu symptoms, conjunctivitis, UTI, gout, yeast infection and travel medication. A forward-facing camera and internet access are required, and a tablet or computer/laptop may be used. Telehealth appointments can be scheduled online through MyChart. Dr. Hemmersmeier is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Familial Hypertension, Coronary Heart Disease, Sacroiliac Joint Disease, and Hypothyroidism.

    Louay Omran
    Experienced in Diarrhea
    Gastroenterology
    Experienced in Diarrhea
    Gastroenterology

    SSM Health Medical Group

    300 Medical Plaza, Suite 310, 
    Lake St. Louis, MO 
     (7.9 miles away)
    Languages Spoken:
    English

    Louay Omran, MD, is a board-certified gastroenterologist, and a formally trained advanced endoscopist. He has the ability to perform endoscopic ultrasound (EUS), ERCP, and luminal stenting to relieve obstruction. Dr. Omran is available for the evaluation and management of patients with both common and challenging gastrointestinal disorders. Dr. Omran attended medical school in Syria, and completed internal medicine residencies and two fellowships (geriatric medicine and gastroenterology & hepatology) at Saint Louis University. He also completed a fellowship in advanced endoscopy and pancreatic diseases at the Medical University of South Carolina. He is a board certified physician nutritionist. Before joining SSM Health Medical Group, Dr. Omran practiced gastroenterology and advanced endoscopy at SSM Health Saint Louis University Hospital as a member of SLUCare. For over 15 years, he was a key faculty member participating in the education and training of students, residents and fellows. He won numerous teaching awards in the process. Dr. Omran was elected to become a Fellow of the American College of Physicians. He is also a member of the American Society for Gastrointestinal Endoscopy, the American Gastrointestinal Association, and the American College of Gastroenterology. Dr. Omran is married to Pascale Salam, MD, and has two sons. His hobbies include reading modern history and biographies, trivia, soccer and tennis. Dr. Omran is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Choledocholithiasis, Childhood Pancreatitis, Acute Pancreatitis, Endoscopy, and Colonoscopy.

    Experienced in Diarrhea
    Internal Medicine
    Experienced in Diarrhea
    Internal Medicine

    Office

    6 Jungermann Cir Ste 201, 
    Saint Peters, MO 
     (1.5 miles away)
    Languages Spoken:
    English

    Brian Stufflebam is a primary care provider, practicing in Internal Medicine in Saint Peters, Missouri. Dr. Stufflebam is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Sitosterolemia, Lung Metastases, Breast Cancer, and High Cholesterol.

    Learn about our expert tiers
    Experienced in Diarrhea
    Family Medicine
    Experienced in Diarrhea
    Family Medicine

    Mcpherson Medical & Diagnostic

    201 First Executive Ave, 
    Saint Peters, MO 
     (2.5 miles away)
    Languages Spoken:
    English

    Shawn Brunk is a primary care provider, practicing in Family Medicine in Saint Peters, Missouri. Dr. Brunk is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Empyema, Sinusitis, Familial Hypertension, and Hypertension.

    Experienced in Diarrhea
    Gastroenterology
    Experienced in Diarrhea
    Gastroenterology

    BJC Medical Group At St Peters

    201 Bjc Saint Peters Dr Ste 200, 
    Saint Peters, MO 
     (2.7 miles away)
    Languages Spoken:
    English

    Mei Huang is a Gastroenterologist in Saint Peters, Missouri. Dr. Huang is rated as an Experienced provider by MediFind in the treatment of Diarrhea. Her top areas of expertise are Diverticular Disease, Familial Adenomatous Polyposis, Esophagitis, Colonoscopy, and Gastrectomy.

    Experienced in Diarrhea
    Family Medicine
    Experienced in Diarrhea
    Family Medicine

    BJC Medical Group At St Peters

    201 Bjc Saint Peters Dr Ste 200, 
    Saint Peters, MO 
     (2.7 miles away)
    Languages Spoken:
    English

    Steven Radel is a primary care provider, practicing in Family Medicine in Saint Peters, Missouri. Dr. Radel is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Diverticular Disease, Cirrhosis, Familial Combined Hyperlipidemia, and Xanthoma.

    Experienced in Diarrhea
    Internal Medicine
    Experienced in Diarrhea
    Internal Medicine

    Hospital Based Practice

    10 Hospital Dr, 
    Saint Peters, MO 
     (2.7 miles away)
    Languages Spoken:
    English

    John Hartweger is an Internal Medicine provider in Saint Peters, Missouri. Dr. Hartweger is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Multisystem Inflammatory Syndrome in Children (MIS-C), Familial Colorectal Cancer, Acute Pancreatitis, Endoscopy, and Colonoscopy.

    Experienced in Diarrhea
    Family Medicine
    Experienced in Diarrhea
    Family Medicine

    SSM St. Charles Clinic Medical Group Inc.

    1475 Kisker Rd Ste 200, 
    Saint Charles, MO 
     (3.4 miles away)
    Languages Spoken:
    English

    Donald Binz is a primary care provider, practicing in Family Medicine in Saint Charles, Missouri. Dr. Binz is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Type 2 Diabetes (T2D), Glucocorticoid-Remediable Aldosteronism, Hypertension, and Familial Hypertension.

    Experienced in Diarrhea
    Internal Medicine
    Experienced in Diarrhea
    Internal Medicine

    BJC Medical Group At O'Fallon

    2630 Highway K, 
    O Fallon, MO 
     (3.9 miles away)
    Languages Spoken:
    English

    Judith Dibble is a primary care provider, practicing in Internal Medicine in O Fallon, Missouri. Dr. Dibble is rated as an Experienced provider by MediFind in the treatment of Diarrhea. Her top areas of expertise are Childhood Iron Deficiency Anemia, Iron Deficiency Anemia, Breast Cancer, and Nephrosclerosis.

    Helen Pappa
    Pediatric Gastroenterology | Pediatrics
    Pediatric Gastroenterology | Pediatrics

    SSM Health Cardinal Glennon Pediatrics Specialty Services

    301 Caledonia Parkway, Suite 220, 
    O Fallon, MO 
     (5.9 miles away)
    Languages Spoken:
    English

    Dr. Helen Pappa treats conditions of the digestive tract, liver and pancreas, including: abdominal pain; Barrett's esophagus; colitis; Crohn's disease; cirrhosis; colorectal cancer and disorders; diabetes; diverticulitis and diverticulosis; gallbladder diseases; hernias; and gastrointestinal disease. Dr. Pappa uses evidence-based medicine in her treatment of patients. Her research interests include improving care for patients with inflammatory bowel disease (IBD), and growth and bone health in patients with IBD. Dr. Pappa is an associate professor in the Department of Pediatrics, Division of Gastroenterology, at Saint Louis University School of Medicine. She also holds a master's degree in public health from Harvard. She is a member of the American Gastroenterological Association, the Crohn's and Colitis Foundation (CCF), and the North American Society for Pediatric Gastroenterology, Hepatology and Nutrition. She is on the pediatric advisory committee of the CCF. Dr. Pappa is the parent of a disabled child and is an advocate for children with disabilities. Dr. Pappa is rated as an Experienced provider by MediFind in the treatment of Diarrhea. Her top areas of expertise are Viral Gastroenteritis, Crohn's Disease, Malnutrition, and Ulcerative Colitis.

    Daniel Kramer
    Experienced in Diarrhea
    Internal Medicine
    Experienced in Diarrhea
    Internal Medicine

    SSM Health Medical Group

    711 Veterans Memorial Parkway, Suite 300, 
    St. Charles, MO 
     (7.2 miles away)
    Languages Spoken:
    English

    Dr. Kramer is board certified in internal medicine. He earned his medical degree and completed his internship and residency at Saint Louis University. Dr. Kramer has been practicing with SSM Health since 2003. Dr. Kramer is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Lung Metastases, Memory Loss, Coronary Heart Disease, and Anemia.

    Kurt Piening
    Experienced in Diarrhea
    Internal Medicine
    Experienced in Diarrhea
    Internal Medicine

    SSM Health Medical Group

    711 Veterans Memorial Parkway, Suite 300, 
    St. Charles, MO 
     (7.2 miles away)
    Languages Spoken:
    English

    Dr. Kurt Piening is an internal medicine specialist who provides comprehensive primary care services for patients ages 18 and older. In addition to a focus on general health, his areas of expertise include obesity, coronary artery disease, chronic high blood pressure, diabetes, respiratory infections, back pain, and muscle pain. Inspired by his Jesuit education, Dr. Piening strives to be a 'Man for Others,' and practicing medicine allows him to do just that. He enjoys the diagnostic challenges that come with being a primary care provider, while being able to care for multiple generations of families. His patients appreciate how knowledgeable, thoughtful, patient, and thorough he is. Dr. Piening is a member of the American Medical Society; American College of Physicians; and the American College of Internal Medicine. Fun fact: Medicine is a family affair for Dr. Piening - his five sons are either licensed physicians or training to become physicians. Dr. Piening is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Lung Metastases, Childhood Pancreatitis, Coronary Heart Disease, Endoscopy, and Colonoscopy.

    Joseph Rodemann
    Experienced in Diarrhea
    Gastroenterology
    Experienced in Diarrhea
    Gastroenterology

    SSM Health Medical Group

    300 Medical Plaza, Suite 310, 
    Lake St. Louis, MO 
     (7.9 miles away)
    Languages Spoken:
    English

    "Dr. Rodemann is board certified in gastroenterology and board certified in internal medicine. He completed a fellowship at the University of Pittsburgh's Division of Gastroenterology, Hepatology and Nutrition, where he was named chief fellow. Prior to that, Dr. Rodemann was a clinical instructor of medicine at Washington University in St. Louis, where he had completed his internal medicine residency. Dr. Rodemann earned his medical degree at Loyola University in Chicago. In addition to inflammatory bowel disease and screening colonoscopy, Dr. Rodemann's areas of interest include irritable bowel syndrome and biliary disease. His particular skills include esophagogastroduodenoscopy, with treatment of variceal and non-variceal bleeding; colonoscopy, with polypectomy and treatment of bleeding; video pill endoscopy; ERCP; PEG placement; and nasal endoscopy with placement of post-pyloric feeding tubes. He is on staff at SSM Health St. Joseph Hospital - Lake Saint Louis. ""I am drawn to gastroenterology because of the opportunity to treat a variety of diseases involving the GI tract, liver and pancreas. I am particularly interested in inflammatory bowel disease and the impact that screening colonoscopy has on preventing colon cancer. I am excited to bring my special training home to the St. Louis area and feel privileged to take care of patients in St. Charles County.""-Joseph Rodemann, MD". Dr. Rodemann is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Morning Sickness, Esophagitis, Painful Swallowing, Endoscopy, and Colonoscopy.

    Syed Tariq
    Experienced in Diarrhea
    Gastroenterology | Internal Medicine
    Experienced in Diarrhea
    Gastroenterology | Internal Medicine

    SSM Health Medical Group

    300 Medical Plaza, Suite 310, 
    Lake St. Louis, MO 
     (7.9 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    "Dr. Tariq is board certified in gastroenterology and internal medicine. His fellowship in gastroenterology and hepatology at Saint Louis University was completed in 2011. Prior to that he had earned board certification in geriatrics and spent over 10 years in the practice of geriatrics and internal medicine, which included patient care, research and teaching, and several directorships of geriatric programs in the St. Louis area. Dr. Tariq's fellowship in geriatrics was served at Saint Louis University, as was his internal medicine residency. ""My years in geriatric medicine were very rewarding. Now with this additional subspecialty, I look forward to helping adult patients of all ages with their gastrointestinal issues. I am excited to have partnered with Dr. Rodemann and SSM Health in this next chapter of my career.""- Syed Tariq, MD". Dr. Tariq is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Gastrointestinal Bleeding, Crohn's Disease, Familial Adenomatous Polyposis, Colonoscopy, and Endoscopy.

    Elizabeth Marsicano
    Experienced in Diarrhea
    Gastroenterology | Internal Medicine
    Experienced in Diarrhea
    Gastroenterology | Internal Medicine

    SSM Health Medical Group

    300 Medical Plaza, Suite 310, 
    Lake St. Louis, MO 
     (7.9 miles away)
    Languages Spoken:
    English

    Dr. Elizabeth Marsicano is a gastroenterologist who treats patients ages 18 and older. She specializes in treating gastroesophageal reflux disease (GERD); esophageal motility/swallowing issues; chronic constipation; chronic diarrhea; celiac disease; Barrett's esophagus; pelvic floor disorders; inflammatory bowel disease (IBD); metabolic liver disease; hepatitis B/C; hemochromatosis; autoimmune liver disease cirrhosis; and gastrointestinal diseases in pregnancy. She also performs colonoscopies and upper endoscopies. Dr. Marsicano aims to create a collaborative relationship with her patients to ensure optimal management of their gastrointestinal concerns through evidence-based practice, education, and mutual understanding. She works closely with her patients and their families to tailor a treatment plan that meets their specific needs and goals. Dr. Marsicano is a founding member of the Missouri Gastroenterology Society; a member of the American College of Gastroenterology; and a member of the American Neurogastroenterology and Motility Society. Fun fact: Dr. Marsicano enjoys traveling, yoga, and reading in her spare time. Dr. Marsicano is rated as an Experienced provider by MediFind in the treatment of Diarrhea. Her top areas of expertise are Ascites, Diverticular Disease, Hemorrhoids, Endoscopy, and Gastrectomy.

    Advanced in Diarrhea
    Internal Medicine
    Advanced in Diarrhea
    Internal Medicine

    Office

    200 Brevco Plz Ste 208, 
    Lake Saint Louis, MO 
     (8.9 miles away)
    Languages Spoken:
    English

    Michael Zerega is an Internal Medicine provider in Lake Saint Louis, Missouri. Dr. Zerega is rated as an Advanced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Collagenous Colitis, Colitis, Hemorrhoids, Gastrectomy, and Gastrostomy.

    Distinguished in Diarrhea
    Gastroenterology
    Distinguished in Diarrhea
    Gastroenterology

    Specialist In Gastroenterology

    11525 Olde Cabin Rd, 
    Saint Louis, MO 
     (13.3 miles away)
    Languages Spoken:
    English
    Offers Telehealth

    Leonard Weinstock is a Gastroenterologist in Saint Louis, Missouri. Dr. Weinstock is rated as a Distinguished provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Mast Cell Activation Syndrome (MCAS), Small Bowel Bacterial Overgrowth, Irritable Bowel Syndrome (IBS), Endoscopy, and Colonoscopy.

    Experienced in Diarrhea
    Gastroenterology
    Experienced in Diarrhea
    Gastroenterology

    Premier Infectious Disease Consultants-O'Fallon

    20 Progress Point Pkwy Ste 206, 
    O Fallon, MO 
     (5.9 miles away)
    Languages Spoken:
    English

    Qaiser Jawaid is a Gastroenterologist in O Fallon, Missouri. Dr. Jawaid is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Choledocholithiasis, Diverticular Disease, Menetrier Disease, Endoscopy, and Gastrectomy.

    Experienced in Diarrhea
    Internal Medicine
    Experienced in Diarrhea
    Internal Medicine

    Premier Infectious Disease Consultants-O'Fallon

    20 Progress Point Pkwy Ste 206, 
    O Fallon, MO 
     (5.9 miles away)
    Languages Spoken:
    English

    Milton Ochieng is an Internal Medicine provider in O Fallon, Missouri. Dr. Ochieng is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Angiodysplasia of the Colon, Benign Esophageal Stricture, Lower Esophageal Ring, Gastrectomy, and Endoscopy.

    Experienced in Diarrhea
    Gastroenterology
    Experienced in Diarrhea
    Gastroenterology

    Office

    5551 Winghaven Blvd Ste 250, 
    O Fallon, MO 
     (5.9 miles away)
    Languages Spoken:
    English

    David Lotsoff is a Gastroenterologist in O Fallon, Missouri. Dr. Lotsoff is rated as an Experienced provider by MediFind in the treatment of Diarrhea. His top areas of expertise are Lower Esophageal Ring, Benign Esophageal Stricture, Painful Swallowing, Gastrectomy, and Gastrostomy.

    Showing 1-20 of 128

    Last Updated: 04/28/2026

    What is the definition of Diarrhea?

    Diarrhea is when you pass loose or watery stool.

    When should I see a Diarrhea doctor near Saint Peters, MO?

    There are various reasons why you may want to see a specialist, such as: 

    • Your primary care provider recommends it. 
    • Your condition requires expert knowledge and specialized care. 
    • Your symptoms persist or worsen despite treatment. 
    • You need specialized testing or procedures. 
    • You want a second opinion.  

    What should I consider when choosing a Diarrhea doctor near Saint Peters, MO?

    It’s important to see a provider with expertise in your specific condition. Each provider profile in MediFind’s doctor database includes information on which conditions they treat, years of experience, research contributions, languages spoken, insurance plans accepted, and more.  

    How does MediFind rank Diarrhea doctors near Saint Peters, MO?

    MediFind’s rankings are based on a variety of data sources, such as the number of articles a doctor has published in medical journals, participation in clinical trials and industry conferences, as well as the number of patients that provider sees for a given condition. Note that MediFind’s provider database is not based on user reviews, and providers do not pay to be included in the database. 

    What types of insurance are accepted by Diarrhea doctors near Saint Peters, MO?

    Most profiles in MediFind’s doctor database include a list of insurance plans accepted by that provider. However, it’s a good idea to contact the provider’s office to make sure they still accept your insurance, then doublecheck by contacting your insurance plan to confirm they’re in network. 

    How can I book an appointment online with a Diarrhea doctor near Saint Peters, MO?

    MediFind offers direct scheduling for certain providers using the “Request Appointment” button on that provider’s profile. If the schedule option is not available for a provider, tap the red “Show Phone Number” button on their profile to get their contact information. If you prefer to find providers who offer online scheduling, select “Schedules online” under the “Availability” category of the filter feature on the left side of the Diarrhea doctor search results page. 

    Why is it important to get a second opinion from a different Diarrhea doctor?

    Second opinions are an opportunity to confirm a diagnosis and its root cause, learn about alternative treatment options, or simply gain peace of mind. Many people, especially those with serious diagnoses, get second opinions so they can understand all their options and make informed decisions, so don’t hesitate to get one if you have any doubts or need more information or clarification regarding your care. Note that some insurance plans require second opinions, while others don’t cover second opinions, so be sure to confirm with your insurance provider first.   

    How can I prepare for my appointment with a Diarrhea doctor near Saint Peters, MO?

    Prepare for your appointment by gathering the following items: 

    • Copies of medical records (dating back at least one year) 
    • Your medical history, including illnesses, medical conditions, surgeries, and other doctors you see 
    • Family history of disease 
    • List of current prescription drugs, over-the-counter medicines, vitamins, and herbal remedies or supplements including names and doses 
    • Allergies to medications, food, latex, insects, etc.  
    • List of questions and concerns 
    • Your insurance card 

    You might also contact the provider’s office to see if they offer transportation or childcare services or if you’re allowed to bring a loved one for support or to take notes during your visit. 

    What questions should I ask my Diarrhea doctor?

    Here are some sample questions: 

    • Can you explain in simple terms what this condition is and how it’s treated? 
    • What symptoms or side effects should I watch for? 
    • What tests will be involved, and when can I expect results? 
    • Are there other specialists I need to see? 
    • What’s the best way to reach you if I have follow-up questions? 

    How can I learn about the latest clinical trials and research advances my Diarrhea doctor may know about?

    MediFind’s Clinical Trials tool asks you a series of questions to help you narrow down your search by health condition, age, gender, location, how far you’re willing to travel, and more. Each question you answer filters down the number of trials until you find the ones that are most relevant to you. 

    MediFind’s Latest Advances tool features summaries of recent articles published in medical journals. We use cutting-edge technology to scour medical publication databases for the latest research advancements on any given condition, then we simplify this information in a way that’s useful and easy to understand. 

    Can I filter my search to show male or female Diarrhea doctors near Saint Peters, MO?

    Look for the filter feature on the left side of the Diarrhea doctor search results page. Select “Female” or “Male” under the “Gender” category to search for female or male providers exclusively. If the “Any” option is selected, it will pull results for both male and female providers. 

    Can I filter my search to find a Diarrhea doctor that offers video calls?

    Look for the filter feature on the left-side of the Diarrhea doctor search results page. Select “Offers telehealth visits” under the Availability category to search for providers who offer virtual appointments (video calls). 

    Reviewed on: 11/11/24  

    By: MediFind Medical Staff 

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