If you're looking for a knowledgeable and approachable internal medicine physician in Tulsa, Dr. Benjamin Houston Greiner, D.O., M.P.H. at Warren Clinic Internal Medicine provides comprehensive care tailored to adult patients. Board-certified and trained at Oklahoma State University Center for Health Sciences, Dr. Greiner specializes in managing chronic conditions such as hypertension, diabetes, obesity, asthma, and seasonal allergies. With a reputation for clear communication and a patient-first approach, he helps individuals take control of their health through preventive care and evidence-based treatment. Board-certified internist with expertise in chronic disease management and preventive care Practices at Warren Clinic Tower in Tulsa—offering convenient access and coordinated services Highly rated for attentive listening, thorough evaluations, and clear medical explanations. Dr. Greiner is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Bleeding. His clinical expertise encompasses Hypothyroidism, Chronic Spontaneous Urticaria (CSU), Asthma, and Hives.

William Briggs is a Gastroenterologist practicing medicine in Tulsa, Oklahoma. He has been practicing medicine for over 40 years. Dr. Briggs is rated as a Distinguished provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 17 other conditions, according to our data. His clinical expertise encompasses Gastrointestinal Bleeding, Painful Swallowing, Swallowing Difficulty, Endoscopy, and Gastrectomy.

"Pooja Singhal, MD, FACG, DABOM is a board-certified gastroenterologist. She completed her medical school training at the University of Oklahoma College of Medicine and an Internal medicine residency at the Georgetown University Hospital in Washington, DC. Dr. Singhal received her fellowship training in Gastroenterology at the Georgetown University hospital as well, where she was selected as Chief Resident and Chief Gastroenterology Fellow. Dr. Singhal's clinical training and interests include General Gastroenterology, Inflammatory bowel disease, Irritable bowel syndrome, Celiac disease, liver diseases including Hepatitis and cirrhosis, diagnostic and therapeutic endoscopy, and Women's gastrointestinal health. Dr. Singhal is a Diplomate of the American Board of Obesity Medicine as well and is trained in Orbera Intra-gastric balloon system. Dr. Singhal has been practicing Gastroenterology for 9 years during which she has performed over 8000 endoscopic procedures. She has been an advocate for community education and has been an active speaker locally and nationally on topics such as Colorectal Cancer screening, Abdominal bloating, Irritable bowel syndrome, Hepatic Encephalopathy, GI diseases in Women and GastroEsophageal reflux disorder. She is a member of the Crohn's and Colitis Foundation committee. Dr. Singhal has received several awards and honors including National SCOPY award consecutively from 2016 to 2019 for raising Colon cancer awareness in Oklahoma, ACG Train the Trainee scholarship, AGA young delegates membership, Caring Star Award, and numerous scholarships. Dr. Singhal holds numerous national positions including American College of Gastroenterology (ACG) Young Scholar leader, ACG Women in GI Mentoring committee chair, and Healio top 200 GI physicians. Dr. Singhal was a part of Oklahoma County Medical Society leadership academy class VII, and currently serves on the board of OCMS. She has been active locally in the medical community, and the Arts community. She also volunteers her time on the Board of Homeless Alliance. Dr. Singhal and her husband were recently blessed with a baby boy, and they enjoy traveling and exploring the world together. ""My care philosophy is simple: Treat others like I would want to be treated. I try my hardest to listen and understand the symptoms and then explain in an easy way various tests and treatment plans. It is important to me that my patients understand the disease process and are actively involved in decision making to select the best management plan for their health."" - Pooja Singhal, MD, FACG, DABOM". Dr. Singhal is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. She is also highly rated in 26 other conditions, according to our data. Her clinical expertise encompasses Trichohepatoenteric Syndrome, Morning Sickness, Familial Colorectal Cancer, Endoscopy, and Gastrectomy. Dr. Singhal is board certified in American Board Of Internal Medicine/Gastroenterology , American Board Of Obesity Medicine , Drug Enforcement Administration , and Oklahoma Bureau Of Narcotics And Dangerous Drugs.

Cristopher Schultz is an Internal Medicine provider practicing medicine in Enid, Oklahoma. Dr. Schultz is rated as a Distinguished provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 48 other conditions, according to our data. His clinical expertise encompasses Menetrier Disease, Diverticular Disease, Gastroesophageal Reflux Disease (GERD), Gastrectomy, and Colonoscopy.

Michael Brzozowski, MD is a hospitalist for SSM Health St Anthony Hospital - Shawnee. Dr. Brzozowski cares for hospitalized patients from admission to discharge. In addition, he is also a member of the SSM Health wound care team. Dr. Brzozowski is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 15 other conditions, according to our data. His clinical expertise encompasses Sepsis, Chronic Obstructive Pulmonary Disease (COPD), Necrosis, Hip Replacement, and Gastrostomy. Dr. Brzozowski is board certified in American Board Of Family Medicine , Drug Enforcement Administration , Oklahoma Bureau Of Narcotics And Dangerous Drugs , and Oklahoma State Board Of Medical Licensure & Supervision.

Eric Cottrill is a Gastroenterologist practicing medicine in Tulsa, Oklahoma. He has been practicing medicine for over 50 years. Dr. Cottrill is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 14 other conditions, according to our data. His clinical expertise encompasses Esophagitis, Lower Esophageal Ring, Benign Esophageal Stricture, Gastrectomy, and Colonoscopy.

Andrew Crawford is a Gastroenterologist practicing medicine in Tulsa, Oklahoma. He has been practicing medicine for over 34 years. Dr. Crawford is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 21 other conditions, according to our data. His clinical expertise encompasses Benign Esophageal Stricture, Lower Esophageal Ring, Swallowing Difficulty, Endoscopy, and Gastrostomy.

Michael Martin is a Gastroenterologist practicing medicine in Tulsa, Oklahoma. He has been practicing medicine for over 41 years. Dr. Martin is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 15 other conditions, according to our data. His clinical expertise encompasses Ulcerative Colitis, Swallowing Difficulty, Painful Swallowing, Endoscopy, and Gastrectomy.

Christian Clark is a Gastroenterologist practicing medicine in Tahlequah, Oklahoma. He has been practicing medicine for over 27 years. Dr. Clark is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 31 other conditions, according to our data. His clinical expertise encompasses Portal Hypertension, Childhood Volvulus, Indigestion, Endoscopy, and Gastrectomy.

Dr. John is a board-certified gastroenterologist. Dr. John is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 10 other conditions, according to our data. His clinical expertise encompasses Benign Esophageal Stricture, Lower Esophageal Ring, Gastrointestinal Bleeding, Gastrectomy, and Endoscopy.

Certified by the American Board of Family Medicine, Gaynell Anderson, MD is a hospitalist for SSM Health St Anthony Hospital - Shawnee. Dr. Anderson cares for hospitalized patients from admission to discharge. Dr. Anderson is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. She is also highly rated in 10 other conditions, according to our data. Her clinical expertise encompasses Sepsis, Necrosis, Acute Kidney Failure, Hip Replacement, and Gastrostomy. Dr. Anderson is board certified in Drug Enforcement Administration , National Board Of Physicians And Surgeons , and Oklahoma State Board Of Medical Licensure & Supervision.

Certified by the American Board of Family Medicine, Ken Darvin, MD is a hospitalist for SSM Health St Anthony Hospital - Shawnee. Dr. Darvin cares for hospitalized patients from admission to discharge. Dr. Darvin is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 13 other conditions, according to our data. His clinical expertise encompasses Sepsis, Acute Kidney Failure, Necrosis, Hip Replacement, and Gastrostomy. Dr. Darvin is board certified in American Board Of Family Medicine , Drug Enforcement Administration , Oklahoma Bureau Of Narcotics And Dangerous Drugs , and Oklahoma State Board Of Medical Licensure & Supervision.

Syed Rizvi, MD, a board-certified gastroenterologist, provides care for adults in the diagnosis and treatment of a wide range of conditions that affect all areas of the digestive tract. He joins an exceptional team of gastroenterology experts, dedicated to partnering with patients in their care and committed to working together to develop a personalized plan for optimal treatment, health and wellbeing. Dr. Rizvi connects with SSM Health's Mission of providing exceptional care through God's healing presence. Dr. Rizvi received his medical degree in Pakistan before completing a gastroenterology and hepatology fellowship at the University of Oklahoma Health Sciences Center. Dr. Rizvi also finished his residency in internal medicine. Prior to joining SSM Health, he has provided care to Oklahomans for nearly two decades. Dr. Rizvi also has experience teaching medical students at the University of Oklahoma College of Medicine. Board certified in gastroenterology, Dr. Rizvi has been published multiple times for his studies. He is a member of the American Gastroenterological Association, the Association of Physicians of Pakistani Descent of North America, the Oklahoma County Medical Society and the Oklahoma State Medical Association. Dr. Rizvi has served as the chair for multiple events and committees for the Association of Physicians of Pakistani Descent of North America. When not caring for his patients, Dr. Rizvi enjoys playing cricket with his friends. Dr. Rizvi is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 8 other conditions, according to our data. His clinical expertise encompasses Swallowing Difficulty, Painful Swallowing, Morning Sickness, Endoscopy, and Colonoscopy. Dr. Rizvi is board certified in American Board Of Internal Medicine/Gastroenterology , Drug Enforcement Administration , Oklahoma Bureau Of Narcotics And Dangerous Drugs , and Oklahoma State Board Of Medical Licensure & Supervision.

Amitabh Saha is a Colorectal Surgeon practicing medicine in Oklahoma City, Oklahoma. Dr. Saha is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 28 other conditions, according to our data. His clinical expertise encompasses Rectal Prolapse, Encopresis, Diverticular Disease, Hemorrhoidectomy, and Colonoscopy.

Rahul Singh is an Emergency Medicine provider practicing medicine in Woodward, Oklahoma. Dr. Singh is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 1 other condition, according to our data. His clinical expertise encompasses Keratomalacia, Viral Gastroenteritis, Urinary Tract Infection in Children, and Multisystem Inflammatory Syndrome in Children (MIS-C).

Randall Herrin is an Emergency Medicine provider practicing medicine in Edmond, Oklahoma. Dr. Herrin is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 1 other condition, according to our data. His clinical expertise encompasses Urinary Tract Infection in Children, Hereditary Pancreatitis, Multisystem Inflammatory Syndrome in Children (MIS-C), and Acute Pancreatitis.

Mark Kiefer is a Colorectal Surgeon practicing medicine in Tulsa, Oklahoma. Dr. Kiefer is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 9 other conditions, according to our data. His clinical expertise encompasses Rectal Prolapse, Familial Colorectal Cancer, Colorectal Cancer, Ileostomy, and Hemorrhoidectomy.

Rodney Clingan is a Colorectal Surgeon practicing medicine in Tulsa, Oklahoma. Dr. Clingan is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Bleeding. He is also highly rated in 15 other conditions, according to our data. His clinical expertise encompasses Rectal Prolapse, Encopresis, Bowel Incontinence, Hemorrhoidectomy, and Ileostomy.

Chris Davis is a General Surgeon practicing medicine in Oklahoma City, Oklahoma. Dr. Davis is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Bleeding. His clinical expertise encompasses Gallbladder Disease, Rectal Prolapse, Diverticular Disease, Hernia Surgery, and Gastrostomy.

Ryan Mckee is a Pediatrics provider practicing medicine in Oklahoma City, Oklahoma. Dr. Mckee is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Bleeding. His clinical expertise encompasses Diarrhea, Anemia, and Gastrointestinal Bleeding.