25 of the Best Pediatric Gastroenterologists Near Me in Michigan, US

Looking for the best pediatric gastroenterologist in Michigan, US? Find the best pediatric gastroenterologist near you in Michigan, US who is an expert in your child's specific condition. A pediatric gastroenterologist is a specialist who treats digestive conditions in children.
Enter a specific health condition to find the right doctor for you

Refine by health condition

Save doctors for later
Sign Up
Not sure about your diagnosis?
Check Your Symptoms
Already have a doctor?
Find A Second Opinion

Pediatric Gastroenterologist Search Results

MediFind found 53 specialists in Michigan, US

Location
LocationClose
53 providers found
    Jeremy Adler
    Expertise in
    8
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    8
    conditions
    Pediatric Gastroenterology | Pediatrics

    C. S. Mott Children's Hospital

    1540 E Hospital Dr, Floor 8 Reception B, 
    Ann Arbor, MI 
    Languages Spoken:
    English

    Jeremy Adler is a Pediatric Gastroenterologist and a Pediatrics provider in Ann Arbor, Michigan. Dr. Adler is highly rated in 8 conditions, according to our data. His top areas of expertise are Crohn's Disease, Viral Gastroenteritis, Colitis, Ileostomy, and Colonoscopy.

    Expertise in
    9
    conditions
    Pediatric Gastroenterology
    Expertise in
    9
    conditions
    Pediatric Gastroenterology

    Henry Ford Medical Center-Royal Oak

    110 E 2nd St, 
    Royal Oak, MI 
    Languages Spoken:
    English

    Uzma Shah is a Pediatric Gastroenterologist in Royal Oak, Michigan. Dr. Shah is highly rated in 9 conditions, according to our data. Her top areas of expertise are Childhood Pancreatitis, Chronic Pancreatitis, Sclerosing Cholangitis, Hereditary Pancreatitis, and Liver Transplant.

    Peter N. Freswick
    Expertise in
    7
    conditions
    Pediatric Gastroenterology
    Expertise in
    7
    conditions
    Pediatric Gastroenterology

    Corewell Health Pediatric Gastroenterology - 35 Michigan St NE

    35 Michigan Street Northeast, Suite 4150, 
    Grand Rapids, MI 
    Experience:
    17+ years
    Languages Spoken:
    English
    Accepting New Patients

    Peter Freswick is a Pediatric Gastroenterologist in Grand Rapids, Michigan. Dr. Freswick has been practicing medicine for over 17 years is highly rated in 7 conditions, according to our data. His top areas of expertise are Eosinophilic Esophagitis, Chronic Idiopathic Constipation (CIC), Exocrine Pancreatic Insufficiency, and Esophagitis. Dr. Freswick is currently accepting new patients.

    Grace J. Lee
    Expertise in
    7
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    7
    conditions
    Pediatric Gastroenterology | Pediatrics

    C. S. Mott Children's Hospital

    1540 E Hospital Dr, Floor 8 Reception B, 
    Ann Arbor, MI 
    Languages Spoken:
    English

    Dr. Grace Jennifer (Jenny) Lee was born and raised in Maryland and earned her medical degree at the Boston University School of Medicine. She completed her residency and fellowship at Nationwide Children’s Hospital in Columbus, Ohio. Dr. Lee has a special clinical and research interest in celiac disease. As a member of the Celiac Disease Program at the University of Michigan, her goal is to improve the quality of care provided to celiac disease patients in their diagnosis and management. Dr. Lee is highly rated in 7 conditions, according to our data. Her top areas of expertise are Celiac Disease, Eosinophilic Esophagitis, Delayed Growth, Crohn's Disease, and Colonoscopy.

    Ryan F. Cox
    Expertise in
    6
    conditions
    Pediatric Gastroenterology
    Expertise in
    6
    conditions
    Pediatric Gastroenterology

    Corewell Health Pediatric Gastroenterology - 35 Michigan St NE

    35 Michigan Street Northeast, Suite 4150, 
    Grand Rapids, MI 
    Experience:
    19+ years
    Languages Spoken:
    English
    Accepting New Patients

    Ryan Cox is a Pediatric Gastroenterologist in Grand Rapids, Michigan. Dr. Cox has been practicing medicine for over 19 years is highly rated in 6 conditions, according to our data. His top areas of expertise are Eosinophilic Esophagitis, Celiac Disease, Encopresis, and Esophagitis. Dr. Cox is currently accepting new patients.

    Deborah L. Cloney
    Expertise in
    6
    conditions
    Pediatric Gastroenterology
    Expertise in
    6
    conditions
    Pediatric Gastroenterology

    Corewell Health Pediatric Gastroenterology - 35 Michigan St NE

    35 Michigan Street Northeast, Suite 4150, 
    Grand Rapids, MI 
    Experience:
    42+ years
    Languages Spoken:
    English

    Deborah Cloney is a Pediatric Gastroenterologist in Grand Rapids, Michigan. Dr. Cloney has been practicing medicine for over 42 years is highly rated in 6 conditions, according to our data. Her top areas of expertise are Eosinophilic Esophagitis, Encopresis, Bowel Incontinence, and Esophagitis.

    Jamal Kriem
    Expertise in
    5
    conditions
    Pediatric Gastroenterology
    Expertise in
    5
    conditions
    Pediatric Gastroenterology

    Corewell Health William Beaumont University Hospital Pediatric Gastroenterology

    3535 West 13 Mile Road, Suite 707, 
    Royal Oak, MI 
    Experience:
    23+ years
    Languages Spoken:
    English, Arabic
    Accepting New Patients

    Jamal Kriem is a Pediatric Gastroenterologist in Royal Oak, Michigan. Dr. Kriem has been practicing medicine for over 23 years is highly rated in 5 conditions, according to our data. His top areas of expertise are Eosinophilic Esophagitis, Celiac Disease, Esophagitis, and Encopresis. Dr. Kriem is currently accepting new patients.

    Mouhib F. Ayas
    Expertise in
    4
    conditions
    Pediatric Gastroenterology
    Expertise in
    4
    conditions
    Pediatric Gastroenterology

    Corewell Health William Beaumont University Hospital Pediatric Gastroenterology

    3535 West 13 Mile Road, Suite 707, 
    Royal Oak, MI 
    Experience:
    41+ years
    Languages Spoken:
    English, Arabic
    Accepting New Patients

    Mouhib Ayas is a Pediatric Gastroenterologist in Royal Oak, Michigan. Dr. Ayas has been practicing medicine for over 41 years is highly rated in 4 conditions, according to our data. His top areas of expertise are Celiac Disease, Eosinophilic Esophagitis, Esophagitis, and Crohn's Disease. Dr. Ayas is currently accepting new patients.

    Amie D. Hinshaw
    Expertise in
    4
    conditions
    Pediatric Gastroenterology
    Expertise in
    4
    conditions
    Pediatric Gastroenterology

    Corewell Health Pediatric Gastroenterology - 35 Michigan St NE

    35 Michigan Street Northeast, Suite 4150, 
    Grand Rapids, MI 
    Experience:
    13+ years
    Languages Spoken:
    English
    Accepting New Patients

    Amie Hinshaw is a Pediatric Gastroenterologist in Grand Rapids, Michigan. Dr. Hinshaw has been practicing medicine for over 13 years is highly rated in 4 conditions, according to our data. Her top areas of expertise are Eosinophilic Esophagitis, Delayed Growth, Encopresis, and Bowel Incontinence. Dr. Hinshaw is currently accepting new patients.

    Vanessa C. Kimball
    Expertise in
    3
    conditions
    Pediatric Gastroenterology
    Expertise in
    3
    conditions
    Pediatric Gastroenterology

    Corewell Health Pediatric Gastroenterology - 35 Michigan St NE

    35 Michigan Street Northeast, Suite 4150, 
    Grand Rapids, MI 
    Experience:
    14+ years
    Languages Spoken:
    English
    Accepting New Patients

    Vanessa Kimball is a Pediatric Gastroenterologist in Grand Rapids, Michigan. Dr. Kimball has been practicing medicine for over 14 years is highly rated in 3 conditions, according to our data. Her top areas of expertise are Eosinophilic Esophagitis, Encopresis, Bowel Incontinence, and Esophagitis. Dr. Kimball is currently accepting new patients.

    Jennifer B. Mitsuya
    Expertise in
    2
    conditions
    Pediatric Gastroenterology
    Expertise in
    2
    conditions
    Pediatric Gastroenterology

    Corewell Health William Beaumont University Hospital Pediatric Gastroenterology

    3535 West 13 Mile Road, Suite 707, 
    Royal Oak, MI 
    Experience:
    14+ years
    Languages Spoken:
    English
    Accepting New Patients

    Jennifer Mitsuya is a Pediatric Gastroenterologist in Royal Oak, Michigan. Dr. Mitsuya has been practicing medicine for over 14 years is highly rated in 2 conditions, according to our data. Her top areas of expertise are Celiac Disease, Eosinophilic Esophagitis, Esophagitis, and Delayed Growth. Dr. Mitsuya is currently accepting new patients.

    Expertise in
    1
    conditions
    Pediatric Gastroenterology
    Expertise in
    1
    conditions
    Pediatric Gastroenterology

    Corewell Health Pediatric Gastroenterology - 35 Michigan St NE

    35 Michigan Street Northeast, Suite 4150, 
    Grand Rapids, MI 
    Experience:
    28+ years
    Languages Spoken:
    English
    Offers Telehealth

    Esteban Ramirez is a Pediatric Gastroenterologist in Grand Rapids, Michigan. Dr. Ramirez has been practicing medicine for over 28 years is highly rated in 1 condition, according to our data. His top areas of expertise are Chronic Idiopathic Constipation (CIC), Colitis, Viral Gastroenteritis, and Encopresis.

    Thomas L. Sutton
    Expertise in
    0
    conditions
    Pediatric Gastroenterology
    Expertise in
    0
    conditions
    Pediatric Gastroenterology

    Corewell Health William Beaumont University Hospital Pediatric Gastroenterology

    3535 West 13 Mile Road, Suite 707, 
    Royal Oak, MI 
    Experience:
    27+ years
    Languages Spoken:
    English
    Accepting New Patients

    Thomas Sutton is a Pediatric Gastroenterologist in Royal Oak, Michigan. Dr. Sutton has been practicing medicine for over 27 years. His top areas of expertise are Malnutrition, Delayed Growth, Celiac Disease, and Lactose Intolerance. Dr. Sutton is currently accepting new patients.

    Shuemein J. Mar
    Expertise in
    8
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    8
    conditions
    Pediatric Gastroenterology | Pediatrics

    C. S. Mott Children's Hospital

    1540 E Hospital Dr, Floor 8 Reception B, 
    Ann Arbor, MI 
    Languages Spoken:
    English

    Shuemein Mar is a Pediatric Gastroenterologist and a Pediatrics provider in Ann Arbor, Michigan. Dr. Mar is highly rated in 8 conditions, according to our data. Her top areas of expertise are Eosinophilic Esophagitis, Celiac Disease, Delayed Growth, Esophagitis, and Colonoscopy.

    George M. Zacur
    Expertise in
    8
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    8
    conditions
    Pediatric Gastroenterology | Pediatrics

    C. S. Mott Children's Hospital

    1540 E Hospital Dr, Floor 8 Reception B, 
    Ann Arbor, MI 
    Languages Spoken:
    English

    George M. Zacur, M.D., M.S. is a member of the faculty of the Division of Pediatric Gastroenterology within the Department of Pediatrics. Dr. Zacur is a native of Miami, FL and earned his degree in medicine at the University of Miami Miller School of Medicine. He also completed his residency in pediatrics at the University of Miami-Holtz Children’s Hospital/Jackson Memorial Medical Center. He then completed his fellowship in pediatric gastroenterology at Cincinnati Children’s Hospital Medical Center. Dr. Zacur has a special interest in Inflammatory Bowel Disease (Crohn Disease and Ulcerative Colitis) and advanced endoscopy. Dr. Zacur is highly rated in 8 conditions, according to our data. His top areas of expertise are Bile Duct Cysts, Eosinophilic Esophagitis, Crohn's Disease, Colonoscopy, and Endoscopy.

    Andrew A. Singer
    Expertise in
    6
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    6
    conditions
    Pediatric Gastroenterology | Pediatrics

    Brighton Center For Specialty Care

    7500 Challis Rd, Entrance 1, Level 2, 
    Brighton, MI 
    Languages Spoken:
    English

    Andrew Singer is a Pediatric Gastroenterologist and a Pediatrics provider in Brighton, Michigan. Dr. Singer is highly rated in 6 conditions, according to our data. His top areas of expertise are Eosinophilic Esophagitis, Celiac Disease, Esophagitis, Delayed Growth, and Colonoscopy.

    Anushree M. Algotar
    Expertise in
    6
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    6
    conditions
    Pediatric Gastroenterology | Pediatrics

    C. S. Mott Children's Hospital

    1540 E Hospital Dr, Floor 8 Reception B, 
    Ann Arbor, MI 
    Experience:
    18+ years
    Languages Spoken:
    English

    Anushree Algotar is a Pediatric Gastroenterologist and a Pediatrics provider in Ann Arbor, Michigan. Dr. Algotar has been practicing medicine for over 18 years is highly rated in 6 conditions, according to our data. Her top areas of expertise are Gastroschisis, Delayed Growth, Malnutrition, and Short Bowel Syndrome.

    Adam Cardullo
    Expertise in
    4
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    4
    conditions
    Pediatric Gastroenterology | Pediatrics

    C. S. Mott Children's Hospital

    1540 E Hospital Dr, Floor 8 Reception B, 
    Ann Arbor, MI 
    Languages Spoken:
    English

    Adam Cardullo is a Pediatric Gastroenterologist and a Pediatrics provider in Ann Arbor, Michigan. Dr. Cardullo is highly rated in 4 conditions, according to our data. His top areas of expertise are Eosinophilic Esophagitis, Chronic Idiopathic Constipation (CIC), Esophagitis, Celiac Disease, and Gastrostomy.

    Expertise in
    8
    conditions
    Pediatric Gastroenterology
    Expertise in
    8
    conditions
    Pediatric Gastroenterology

    Regents Of The University Of Michigan

    7500 Challis Rd, 
    Brighton, MI 
    Languages Spoken:
    English

    Anita Sharma is a Pediatric Gastroenterologist in Brighton, Michigan. Dr. Sharma is highly rated in 8 conditions, according to our data. Her top areas of expertise are Eosinophilic Esophagitis, Celiac Disease, Delayed Growth, Bowel Incontinence, and Colonoscopy.

    Expertise in
    6
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    6
    conditions
    Pediatric Gastroenterology | Pediatrics

    C. S. Mott Children's Hospital

    1540 E Hospital Dr, Floor 8 Reception B, 
    Ann Arbor, MI 
    Languages Spoken:
    English

    Chris J. Dickinson, M.D. attended Wayne State University in Detroit, Michigan where he received a B.A. in Chemistry, followed by his M.D. degree in 1981. He then completed a General Pediatric Residency at Rainbow Babies and Children’s Hospital in Cleveland, Ohio. In 1984, he began a Pediatric Gastroenterology Fellowship Program at the University of Michigan in Ann Arbor. Dr. Dickinson became a faculty member in the Department of Pediatrics in July 1986 and has continued to serve in the division of Pediatric Gastroenterology as the chief of the division from July 1999 through June 2011.Dr. Dickinson served as an Associate Chief of Staff for the Office of Clinical Affairs beginning June 2003 and concluding in July 2011. He was appointed as the Pediatric Associate Chief Medical Officer (PACMO) for the University of Michigan and C.S. Mott Children’s and Women’s Hospital, on July 1st, 2011. On April 5th, 2012 Dr. Dickinson was appointed as the Interim Executive Director for the University of Michigan and C.S. Mott Children’s and Women’s Hospital. Dr. Dickinson has been deeply involved in several safety and quality initiatives throughout the entire health system since becoming an Associate Chief. In his new role as PACMO and as the Interim Executive Director, he will continue to focus and achieve new safety and quality standards primarily in new C.S. Mott Children’s Hospital and Von Voigtlander Women’s Hospital. Dr. Dickinson is highly rated in 6 conditions, according to our data. His top areas of expertise are Eosinophilic Esophagitis, Esophagitis, Celiac Disease, and Eosinophilic Enteropathy.

    Expertise in
    6
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    6
    conditions
    Pediatric Gastroenterology | Pediatrics

    C. S. Mott Children's Hospital

    1540 E Hospital Dr, Floor 8 Reception B, 
    Ann Arbor, MI 
    Languages Spoken:
    English

    Alejandro Velez is a pediatric gastroenterologist with additional expertise in neurogastroenterology and motility in children. Alejandro was born in Colombia and moved to the US as a teenager spending most of his early adult life in the northeast. His training includes undergraduate education at the University of Maine, medical school at the University of Vermont, pediatric residency at Children's Hospital at Montefiore and pediatric gastroenterology fellowship in Cincinnati Children's Hospital. He is an assistant professor of pediatrics for the University of Michigan medical school and a faculty member for the division of pediatric gastroenterology of C.S. Mott Children's hospital. His passion in medicine includes the treatment of childhood constipation, motility disorders (achalasia, pseudo-obstruction), and disorders of gut-brain interaction (irritable bowel syndrome, functional abdominal pain, etc). Dr. Lopez is highly rated in 6 conditions, according to our data. His top areas of expertise are Encopresis, Total Intestinal Aganglionosis, Hirschsprung Disease, and Bowel Incontinence.

    Expertise in
    4
    conditions
    Pediatric Gastroenterology
    Expertise in
    4
    conditions
    Pediatric Gastroenterology

    Henry Ford St. John Children's Center-Waldenburg

    17900 23 Mile Rd Ste 101, 
    Macomb, MI 
    Languages Spoken:
    English

    Sanjay Kumar is a Pediatric Gastroenterologist in Macomb, Michigan. Dr. Kumar is highly rated in 4 conditions, according to our data. His top areas of expertise are Acute Pain, Enlarged Liver, T-Cell Lymphoma, Adenoidectomy, and Gallbladder Removal.

    Expertise in
    4
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    4
    conditions
    Pediatric Gastroenterology | Pediatrics

    C. S. Mott Children's Hospital

    1540 E Hospital Dr, Floor 8 Reception B, 
    Ann Arbor, MI 
    Languages Spoken:
    English

    Lindsey Lawrence is a Pediatric Gastroenterologist and a Pediatrics provider in Ann Arbor, Michigan. Dr. Lawrence is highly rated in 4 conditions, according to our data. Her top areas of expertise are Chronic Idiopathic Constipation (CIC), Celiac Disease, Eosinophilic Esophagitis, and Delayed Growth.

    Expertise in
    4
    conditions
    Pediatric Gastroenterology
    Expertise in
    4
    conditions
    Pediatric Gastroenterology

    Office

    3535 W 13 Mile Rd Ste 707, 
    Royal Oak, MI 
    Languages Spoken:
    English

    Souheil Gebara is a Pediatric Gastroenterologist in Royal Oak, Michigan. Dr. Gebara is highly rated in 4 conditions, according to our data. His top areas of expertise are Eosinophilic Esophagitis, Celiac Disease, Crohn's Disease, and Esophagitis.

    Expertise in
    1
    conditions
    Pediatric Gastroenterology | Pediatrics
    Expertise in
    1
    conditions
    Pediatric Gastroenterology | Pediatrics

    Brighton Center For Specialty Care

    7500 Challis Rd, Entrance 1, Level 2, 
    Brighton, MI 
    Languages Spoken:
    English

    Samantha Saul is a Pediatric Gastroenterologist and a Pediatrics provider in Brighton, Michigan. Dr. Saul is highly rated in 1 condition, according to our data. Her top areas of expertise are Atresia of Small Intestine, Eosinophilic Esophagitis, Delayed Growth, and Encopresis.

    Showing 1-25 of 53

    When should I see a Pediatric Gastroenterologist in Michigan, US?

    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 Pediatric Gastroenterologist in Michigan, US?

    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 Pediatric Gastroenterologists in Michigan, US?

    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 Pediatric Gastroenterologists in Michigan, US?

    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 Pediatric Gastroenterologist in Michigan?

    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 Pediatric Gastroenterologist search results page. 

    Why is it important to get a second opinion from a different Pediatric Gastroenterologist?

    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 Pediatric Gastroenterologist in Michigan, US?

    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 Pediatric Gastroenterologist?

    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 Pediatric Gastroenterologist 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 Pediatric Gastroenterologists in Michigan, US?

    Look for the filter feature on the left side of the Pediatric Gastroenterologist 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 Pediatric Gastroenterologist that offers video calls?

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

    Reviewed on: 11/07/24  

    By: MediFind Medical Staff 

    Read more about our Content Policy

    Pediatric Gastroenterologists by city