Welcome to Granite State Gastrointestinal Consultants!

We are a group of four physicans, two physican assistants, and one nurse practitioner providing experienced high quality medical care for patients with disorders of the gastrointestinal tract, liver and pancreas. Our physicians are all Board Certified in Gastroenterology.

Our physicians, physician assistants, and staff are proud to offer friendly, courteous, and knowledgeable care close to home. We are dedicated to treating each patient as an individual.

We hope that this website will help you to get to know our practice and provide helpful information on gastrointestinal disorders and endoscopic procedures.

Please feel free to contact us make an appointment @ (603) 432-8802.

We look forward to seeing you!



We are excited to announce Allison Anastasoff APRN, will be joining our practice in January 2019!



Allison holds a national certification with the American Association of Nurse Practitioners (AANP).

Allison Anastasoff completed her Bachelor of Science in Nursing at Saint Anselm College in 2007. During that time she worked as a nurse in the Intensive Care Unit Cardiovascular Operating Room, and was a Research Coordinator. She earned her Master of Science in Nursing at the University of New Hampshire.  She spent 2 years practicing family medicine prior to joining Granite State GI Consultants in 2019. Allison enjoys spending time with family and friends, traveling, and cooking. She and her husband reside in Auburn with their rescue dog, Bella. Allison will be available as of January 2019.

Contact us today at (603) 432-8802, to make an appointment at one of our 3 convenient office locations in Bedford, Derry or Windham.








  Dr. Christopher Dainiak, of Granite State Gastrointestinal Consultants, discusses these VERY important health topics with the New Hampshire Medical Society on Talk Radio: 


Why is a colon rectal screening important?

When should a patient consider having a colon screening?

Who is considered a high risk patient for colon cancer?

What is considered a high risk factor for colon cancer?

 How does one prepare for a screening, and where is the procedure performed?

What to expect after the procedure? And much, much more!






(Copy Credit to New Hampshire Medical Society, On Call Talk Radio.)









We are pleased to announce that our BEDFORD office has moved into a new location:


160 South River Road, Suite 2300 Bedford, NH 03110


Located less than one mile from our previous location, our new suite is located on the second floor:

160 South River Road, Suite 2300 Bedford, NH 03110


Our staff will be happy to answer any questions that you may have regarding our practice.

Please feel free to call us at (603) 432-8802 to schedule your appointment today.


March 18, 2020

Granite State Gastroenterology (GSG) is implementing changes to how we evaluate patients due to the COVID-19 pandemic.

Beginning March 24, 2020, GSG will evaluate all patients using telemedicine. Telemedicine uses a telephone and, when needed, a video connection between two devices, such as a computer and smartphone, to allow a health care professional and patient to have a “virtual visit”. Telemedicine will allow us to continue to see, evaluate, and treat patients with gastrointestinal conditions while maintaining social distance as has been recommended by public health authorities such as the Centers for Disease Control and Prevention (CDC). By doing this we hope to protect our patients and staff from potential COVID-19 exposure or infection.

Read More