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Gastroenterologists in St. Louis, MO

230 listed in St. Louis, MO · Listings last verified October 2026 · How we vet listings

We list 230 gastroenterologists in the St. Louis area, most of them in St. Louis, Chesterfield and St. Peters. All are physicians (MD or DO), shown with the practice's phone number, address and Google rating where we could match one. 12 practices say they offer telehealth visits. Use the filters to narrow by city, telehealth, Medicare or Medicaid.

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Nicholas W. Frederickson, MD

Gastroenterology

Address
901 Patients First Drive Suite 3300, Washington 63090
Telehealth
Not listed
Medicare
Not listed
Medicaid
Not listed
Call (636) 239-7344 Directions

Last verified Oct 2026 Report a correction

Nikhil Banerjee, MD

Specialists in Gastroenterology

Gastroenterology

Practice rating 4.6 (621 Google reviews)

Address
11525 Olde Cabin Rd, St. Louis 63141
Telehealth
Practice offers telehealth
Medicare
Practice accepts Medicare
Medicaid
Not listed
Call (314) 997-0554 Website Directions

Last verified Oct 2026 Report a correction

Patrick B. McDonough, MD

SSM Health Medical Group

Gastroenterology

Practice rating 4.8 (25 Google reviews)

Address
12266 De Paul Dr Ste 300, Bridgeton 63044
Telehealth
Not listed
Medicare
Not listed
Medicaid
Not listed
Call (314) 291-8824 Website Directions

Last verified Oct 2026 Report a correction

Picha Moolsintong, MD

St. Louis Gastroenterology Consultants

Gastroenterology

Practice rating 2.9 (11 Google reviews)

Address
3555 Sunset Office Dr Ste 107, St. Louis 63127
Telehealth
Not listed
Medicare
Not listed
Medicaid
Not listed
Call (314) 543-5200 Website Directions

Last verified Oct 2026 Report a correction

Qaiser Jawaid, MD

BJC Medical Group at Progress West - Specialists

Gastroenterology

Practice rating 4.8 (4 Google reviews)

Address
20 Progress Point Pkwy Ste 206, O'Fallon 63368
Telehealth
Not listed
Medicare
Not listed
Medicaid
Not listed
Call (636) 344-1073 Website Directions

Last verified Oct 2026 Report a correction

Rajesh N. Keswani, MD

Gastroenterology | Washington University School of Medicine

Gastroenterology

Address
4921 Parkview Pl, St. Louis 63110
Telehealth
Not listed
Medicare
Not listed
Medicaid
Not listed
Call (314) 747-2066 Website Directions

Last verified Oct 2026 Report a correction

Raymond F. Mohrman Jr., MD

SSM Health Medical Group

Gastroenterology

Practice rating 4.8 (25 Google reviews)

Address
12266 De Paul Dr Ste 300, Bridgeton 63044
Telehealth
Not listed
Medicare
Not listed
Medicaid
Not listed
Call (314) 291-8824 Website Directions

Last verified Oct 2026 Report a correction

In the St. Louis area

Our St. Louis listings cover the Missouri side of the metro: St. Louis County, St. Louis City, St. Charles County, Jefferson County, Franklin County and Lincoln County. Providers on the Illinois side, such as Belleville, Edwardsville and Alton, are listed under the Belleville–Metro East area.

Specialist care here is concentrated in a few large health systems: BJC HealthCare with Barnes-Jewish Hospital and Washington University physicians, Mercy, SSM Health and St. Luke's Hospital in Chesterfield. Each has clinics well beyond its main campus, so the same practice may have offices in the city, west St. Louis County and St. Charles County. Independent specialty groups practice alongside them, especially in Creve Coeur, Chesterfield and along the I-70 corridor in St. Peters, O'Fallon and Wentzville.

Most listings are in the City of St. Louis and St. Louis County, with a growing share in St. Charles County. If you live in Jefferson or Franklin County, check Festus and Washington before driving into the city.

Gastroenterologists here practice mainly through Washington University, Mercy, SSM Health and St. Luke's, plus independent GI groups in west county and St. Charles County. Many practices run their own endoscopy centers, so ask where your colonoscopy would be done.

Nearby: Belleville–Metro East, IL · Columbia–Jefferson City, MO · Cape Girardeau, MO

By town

How to choose a gastroenterologist

A gastroenterologist, or GI doctor, diagnoses and treats problems of the digestive tract: the esophagus, stomach, intestines, colon, liver, pancreas and gallbladder. People see one for heartburn that won't go away, ongoing belly pain, diarrhea or constipation, bleeding, Crohn's disease or ulcerative colitis, and for colonoscopies.

Start with the kind of care you need. Many GI doctors handle a wide range of problems, but some focus on one area:

  • General gastroenterologists handle most needs: reflux, ulcers, irritable bowel syndrome, screening colonoscopies and follow-up on abnormal tests.
  • Inflammatory bowel disease (IBD) specialists manage Crohn's disease and ulcerative colitis over the long term.
  • Advanced endoscopists do complex scope procedures, such as removing large polyps or treating bile duct and pancreas problems.
  • Hepatologists focus on the liver. Many are gastroenterologists with extra liver training.

If you're not sure, a general gastroenterologist is the right first stop. They'll refer you on if you need a subspecialist.

Check credentials. Board certification in gastroenterology shows a doctor has finished specialty training and passed a certification exam. You can look up any doctor's certification for free on the American Board of Internal Medicine website [1]. Our listings show the credentials doctors report in the federal NPI registry, but we don't verify board certification.

Know if you're due for a colonoscopy. Experts recommend colorectal cancer screening for adults ages 45 to 75 [2]. A colonoscopy is one option. Some people can start with a stool test instead. Ask your primary care doctor which test fits you, and whether your family history means you should start earlier.

Confirm insurance before you book. Practices change the plans they accept, so call the office or check your insurer's directory. HMO plans usually need a referral first. Medicare Part B covers medically necessary specialist visits; you typically pay 20% of the Medicare-approved amount after your deductible [5].

Ask where procedures are done. Colonoscopies and other scopes happen in a hospital or a separate endoscopy center. The location can change what you pay, so ask before you schedule.

Know when not to wait. Vomiting blood or material that looks like coffee grounds, black or tar-like stool, or feeling faint, confused or cold and clammy with belly symptoms need emergency care, not an appointment [4]. Call 911.

Frequently asked questions

Do I need a referral to see a gastroenterologist?

It depends on your insurance. Most HMO plans require a referral from your primary care doctor before they'll cover a specialist visit. PPO plans and traditional Medicare usually don't. Some GI practices also want a referral or recent test results before they book you, especially for a procedure, so call ahead and ask what to bring.

At what age should I get a colonoscopy?

The U.S. Preventive Services Task Force recommends colorectal cancer screening for adults ages 45 to 75. A colonoscopy is one way to screen, and stool tests are another. People with a family history of colon cancer, certain polyps or inflammatory bowel disease may need to start earlier or screen more often. Ask your doctor what's right for you.

Does Medicare cover a screening colonoscopy?

Yes. Medicare Part B covers a screening colonoscopy once every 120 months for most people, or once every 24 months if you're at high risk. There's no minimum age. You pay nothing for the screening if your doctor accepts assignment. If a polyp is removed during the test, you may owe a share of the cost.

What happens at a first GI appointment?

Expect questions about your symptoms, diet, bowel habits, medications and family history, plus a physical exam. The doctor may order blood work, a stool test, imaging or a scope procedure such as an upper endoscopy or colonoscopy. Bring a list of your medications and any recent lab results, scans or procedure reports.

How do I know if a gastroenterologist is board certified?

Look the doctor up on the American Board of Internal Medicine's free "Verify a Physician" tool, which shows whether they're certified in gastroenterology. Our listings show the credentials doctors report to the NPI registry, but we don't verify certification ourselves.

Sources

  1. American Board of Internal Medicine — Verify a physician's certification
  2. U.S. Preventive Services Task Force — Colorectal cancer screening
  3. Medicare.gov — Colonoscopies (screening)
  4. NIDDK — Symptoms and causes of GI bleeding
  5. Medicare.gov — Doctor & other health care provider services (Part B)