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32 years

Welcome To Our Practice

Digestive & Liver Disease


Digestive & Liver Disease Consultants, P.A. dba DLDC has been providing outstanding Gastrointestinal and Liver care for patients in the Harris and Montgomery counties since 1988. The highly acclaimed group of gastroenterologists, board certified in internal medicine, gastroenterology, and liver diseases have enjoyed a superb reputation in the community. The practice has been serving patients at three convenient locations in North Houston, Humble/Kingwood and the Woodlands/Conroe areas. From consultative services and diagnostic procedures and most importantly endoscopic procedures, the physicians at DLDC have achieved a seamless integration of services, by providing them under one roof.

DLDC boasts a state-of-the-art, modern gastrointestinal diagnostic center and a fully accredited endoscopy and surgery center. Every detail is attended to meticulously at the center in an effort to transform each patient's care into a gratifying experience.


The team approach at DLDC with its university trained physicians, skilled medical assistants and quality nursing staff makes each patient's experience further unique and memorable.

Meet Our Providers

Dr. Guru N. Reddy trained at Baylor College of Medicine. He is Board Certified in Gastroenterology and Internal Medicine with specialization in Liver Disease and Nutrition.

Howard B. Hamat, MD, FRCP
Howard B. Hamat, MD, FRCP

Dr. Howard B. Hamat trained at University of Toronto. He is Board Certified in Gastroenterology and Internal Medicine with Advanced training in Inflammatory Bowel Disease and Therapeutic Biliary Endoscopy

Nathaniel Kwak, MD
Nathaniel Kwak, MD

Dr. Nathan Kwak is board certified in Gastroenterology and Internal Medicine with Advanced training in interventional and therapeutic endoscopy.

Hamza A. Aziz, M.D
Hamza A. Aziz, M.D

Dr. Hamza Aziz is board certified in Internal Medicine and Board eligible in gastroenterology. He is well trained in all fields of gastroenterology and possess excellent endoscopic skills.

Mohamed D. Mahmoud, M.D
Mohamed D. Mahmoud, M.D

Dr. Mahmoud is board certified in Internal Medicine and is board eligible in Gastroenterology. Dr. Mahmoud excels as a good clinician and endoscopist in various fields of Gastroenterology and Endoscopy.

Laura Peterkin, PA-C
Laura Peterkin, PA-C

Laura Peterkin has been a Board Certified Physician Assistant since 2001. She has been working in gastroenterology for the past 19 years.

Connie Delos Reyes, MSN, FNP-C
Connie Delos Reyes, MSN, FNP-C

Connie Delos Reyes is a certified family nurse practitioner, board certified by the American Academy of Nurse Practitioners.

Katie Bycura, FNP-BC
Katie Bycura, FNP-BC

Katie Bycura is a Family Nurse Practitioner, board certified through the American Nurses Credentialing Center.

Digestive & Liver Disease Consultants, P.A.
Digestive & Liver Disease Consultants, P.A.

Shared Decision Making

We believe that informed patients are better prepared to make decisions regarding their health and well being. We have included an extensive section on this website covering the full array of topics associated with diagnoses and treatment options for digestive health and liver disease. We encourage you to review these pages whenever you have an interest or concern regarding the health of your digestive system. 

Through our novel, integrative approach, we pride ourselves on spending the time necessary to address, analyze and treat difficult medical and digestive issues that can often be overlooked in today's fast paced healthcare environment. The focus of our practice is to work with you through all phases of your care, so that we can assist you or your loved one in living a happy, healthy and productive life.


Houstonia Magazine Honors Local Gastroenterologist for the 4th Consecutive Year

Local Physician Wins Top Doc Award for 11th Year in a Row

Dr. Reddy is very professional. Has an excellent bedside manner with his patients

Awarded Houston’s Top Docs from
2006 - 2019

Digestive & Liver Disease Consultants physicians have been featured in the acclaimed H-Texas Magazine

Voted Top Gastroenterologists and Hepatologists in Houston

Houston's Top Docs in Houstonia Magazine from 2013 - 2018

Highly acclaimed gastroenterologists

Digestive and Liver Disease Consultants boasts State of the Art facilities.


Contact us

Our Clinic Locations

  • North Houston / Spring

    275 Lantern Bend Dr. Suite 200 Houston, TX 77090

  • Humble / Kingwood

    18955 Memorial North Suite 500 Humble, TX 77338

  • The Woodlands

    920 Medical Plaza Dr.  Suite 550 The Woodlands, TX 77380