Dr. Gregory Shannon, MD

Gastroenterology  |  
Male  |  
Age 47
Insurances AcceptedSave
Dr. Gregory Shannon, MD
Dr. Gregory Shannon, MD is a gastroenterology doctor who practices in Sugar Land, TX. He is 47 years old and has been practicing for 21 years. Dr. Shannon is affiliated with Memorial Hermann Sugar Land Hospital, St. Luke's Sugar Land Hospital, Houston Methodist Sugar Land Hospital and Memorial Hermann - Texas Medical Center.

17510 W Grand Pkwy S Ste 220

Sugar Land, TX 77479

Contact Information

(281) 201-1338

Dr. Gregory Shannon, MD

Dr. Gregory Shannon, MD

Accepted insurance

  • Aetna
  • Amerigroup (Wellpoint)
  • Assurant Health
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of Texas
  • Cigna
  • Commercial Insurance Company
  • Coventry Health Care
  • EmblemHealth
  • First Health (Coventry Health Care)
  • Golden Rule
  • Government Employees Health Association (GEHA)
  • HAP Insurance
  • Harvard Pilgrim Health Care
  • 8 More

*Please verify this information when scheduling an appointment.

Learn about Dr. Shannon

Dr. Shannon's Experience

Dr. Shannon's experience matches your search based on the following criteria:
  • Based on total number of patients treated over the last 12 months
  • Specializes in Gastroenterology
  • Board certified in Gastroenterology
  • No malpractice claims found
  • No sanctions found
  • No board actions found


  • Gastroenterology

Board Certifications

  • Gastroenterology
    Accredited by: American Board of Internal Medicine*

Conditions Treated

  • Abdominal Disorders
  • Abdominal Pain
  • Anemia
  • Autoimmune Diseases
  • Barrett's Esophagus
  • Benign Neoplasm of the Digestive System
  • Benign Tumor
  • Biliary Atresia
  • Blood Disorders
  • Cancer
  • Cholecystitis and Gallstones
  • Colorectal Cancer
  • Constipation
  • Crohn's Disease
  • Dehydration
  • Diaphragmatic and-or Hiatal Hernia
  • Diarrhea
  • Diverticulitis, Intestinal
  • Diverticulosis, Intestinal
  • Duodenal Ulcer
  • Duodenitis
  • Dysentery
  • Dysphagia
  • Esophageal Diseases
  • Esophageal Varices
  • Esophagitis
  • Gallstones
  • Gas-Bloat Syndrome
  • Gastric Ulcer
  • Gastritis
  • Gastroesophageal Reflux Disease (GERD)
  • Gastrointestinal Bleeding
  • Gastrointestinal Diseases
  • Gastrointestinal Malabsorption
  • Heartburn
  • Hemorrhoids
  • Hepatitis B - Immune Response
  • Hepatitis C
  • Hernia
  • Indigestion
  • Inflammatory Bowel Disease
  • Intestinal Obstruction
  • Irritable Bowel Syndrome
  • Malnutrition
  • Nausea
  • Non-Alcoholic Fatty Liver Disease
  • Non-Neonatal Jaundice
  • Noninfectious Gastroenteritis and Colitis
  • Pancreatitis
  • Peptic Ulcer
  • Pyloric Stenosis
  • Reflux Esophagitis
  • Stomach Cancer
  • Stomach Diseases
  • Stomach and Small Intestine Cancer
  • Ulcer
  • Ulcerative Colitis
  • Unexplained Weight Loss
  • Vascular Insufficiency of Intestines
  • Viral Hepatitis
  • Vomiting Disorders


Read More


  • Colonoscopy, Proctosigmoidoscopy, and Sigmoidoscopy
  • Endoscopy (Esophagus, Stomach, Small Intestine)
  • Gastroenterology Procedures
  • Liver Biopsy

Background Check

0 Malpractice Claims

No malpractice history found for Texas.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • Xavier University Of Louisiana
    Undergraduate School | Graduated 1992
  • Northwestern University The Feinberg School Of Medicine
    Medical School | Graduated 1996
  • Baylor University
    Internship Hospital | Completed 1997
  • Baylor University
    Residency Hospital | Completed 1999
  • Baylor University
    Fellowship Hospital | Completed 2002

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Shannon has no media or publications listed.

Languages Spoken

  • English
  • Spanish

Memberships & Professional Affiliations

Dr. Shannon does not have any memberships or affiliations listed. If you are Dr. Shannon and would like to add memberships or affiliations, please update your profile.

Dr. Shannon's Reviews

Likelihood of recommending Dr. Shannon to family and friends
based on 39 total reviews (13 with comments)
Dr. Shannon's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    10 to 15 minutes
Patient Comments (13)
Pearland Tx |
Dr. Shannon is good at what he does. One of the best GI docs I’ve seen & I went thru a few to find him by word of mouth. Saw his NP this last time & I was hestitant at first but she was extremely nice & very knowledgeable about everything. So now I feel comfortable seeing either of them.
Sugarland, Texas |
Great doc and has always been! Always addresses my needs and spend a great deal of time with me! The best for my GI problems!!! Top notch
Sugar Land, TX |
Saw Dr. Shannon over a year ago with stomach issues. I waited a long time in the lobby. It was crowded and not enough seats. Finally got in and he just talked to me. He never examined me. Told me to take a probiotic and see him in two months. Came back in 2 months. He had no recommendation until I told him I thought I had cancer. Turns out I had breast cancer. Never went back to him. Saw a new doctor after I completed cancer treatment. He did a colonoscopy and found polyps and diverticulitis
in Houston, TX |
I went to see Dr. Shannon after one of my colleagues recommended him. Staff was excellent at accommodating me. When I made it to my appointment I actually saw his nurse practitioner. I was not aware that I would be seeing the her when I made the appointment. She was great! Made me feel at ease and was very knowledgeable. I asked her how long she had been a nurse. 15+ years. When I went for my procedure I met Dr. Shannon prior to my procedure, reviewed my problems, and he did a wonderful job! A++
houston, tx |
Dr. Shannon's staff is rude and the office seems to be very disorganized. I had to wait nearly one hour only to see the NP. I was scheduled for a colonoscopy without every seeing the doctor. I only saw the NP during my visit. The doctor never came in an introduced himself, which made me hesitant to have the procedure performed, so I subsequently cancelled.
Missouri City, TX |
Based on reviews and word of mouth, I made an appointment with Dr. Shannon. I waited 3 weeks to see him. I took the morning off from work. ONE HOUR before my appointment, I got a call from his office that the appointment location had changed. When I went to the new location, I was evaluated by his NP. I asked when I would be able to see Dr. Shannon and was told that he is in surgery all day. I didn't wait 3 weeks and pay a specialist co-pay to be seen by his NP.
Sugar Land, TX |
I'm a physician and a patient of Dr. Shannon. I can confidently say he is a well trained, highly skilled, and very personable doctor. We as patients are lucky to have such a professional for our care. I unequivocally recommend Dr. Shannon!
in Richmond, TX |
I scheduled an appointment with Dr. Shannon to have an EGD procedure performed for an upcoming surgery with another surgeon. However, when I arrived for my appointment I was told that I had been given the wrong time and date, Dr. Shannon was in surgery. Therefore, I was asked and given a time to return later that day, when his surgery clinic had ended. When I returned, I waited over 30 minutes before I was called into an exam room. Once I finally was put into an exam room, his nurse had updated
in Missouri City, TX |
Outstanding Doctor! He makes you feel very comfortable and knowledgeable. He doesn't make you feel like you are being rushed and he answers your questions thoroughly. His bedside matters are excellent, he explains his procedures and his findings. I didn't feel like a doctor payment but like an actual patient. His staff was also polite and helpful.
in Stafford, TX |
Front desk is rude and very unprofessional
in Sugar Land, TX. |
From the moment we walked into Dr. Shannon's I was impressed. The staff was very caring. Dr. Shannon himself was great. Asked questions and listened to my sons answers. We walked out of his office feeling very at ease.
in Houston, TX |
This doc was awesome! Handled my situation with great care and concern! My wife was equally satisfied with his care and bedside manner. A really terrific doctor! I recommend him highly!!!!
in Wharton, TX |
Scheduling nightmare.Started in Dec.2015 saw him Jan13th 2016 Dr. Shannon ordered colonoscopy before even seeing me. Haven't even talked to him yet about the problem I was having. I saw Dr. Shannon for every bit of three minutes. No exam just told me that I was close to 50 and he could give me a colonoscopy to see what was going on.Gave me meds for something he has no idea could be the problem. Colonoscopy set for Feb.2nd. insurance problems with OakBend had to reset for March 3rd. Not happening
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Now Accepting New Patients
Dr. Shannon accepts 22 insurance carriers
  • Aetna
    Aetna HMO
    Choice Plus POS II
  • Amerigroup (Wellpoint)
  • Assurant Health
  • Blue Cross Blue Shield
    Blue Card PPO
  • Blue Cross Blue Shield of Texas
    Blue Advantage HMO
    Blue Choice
  • Cigna
    Cigna HMO
    Cigna PPO
    Great West Healthcare-Cigna PPO
    Open Access Plus
  • Commercial Insurance Company
  • Coventry Health Care
  • EmblemHealth
    Emblem Health
  • First Health (Coventry Health Care)
    First Health (Coventry Health Care) PPO
  • Golden Rule
  • Government Employees Health Association (GEHA)
  • HAP Insurance
    Health Alliance
  • Harvard Pilgrim Health Care
    Harvard Pilgrim Health Care PPO
  • HealthSmart
  • Humana
    Choice Care PPO
    Preferred PPO
  • Humana Health Plan of Texas
    Houston Area HMO-Standard
  • MHealth Insured
  • MultiPlan
    MultiPlan PPO
  • Principal Life
  • UnitedHealthCare
    Choice Plus POS
    Navigate HMO
    Navigate POS
    Options PPO
  • Universal American

*Please verify this information when scheduling an appointment.

Hospitals where Dr. Shannon has admitting privileges

Memorial Hermann - Texas Medical Center
6411 Fannin St
Houston, TX 77030
View Hospital Profile
Memorial Hermann Sugar Land Hospital
17500 W Grand Pkwy S
Sugar Land, TX 77479
View Hospital Profile
Houston Methodist Sugar Land Hospital
16655 Southwest Fwy
Sugar Land, TX 77479
View Hospital Profile
St. Luke's Sugar Land Hospital
1317 Lake Pointe Pkwy
Sugar Land, TX 77478
View Hospital Profile

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