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Oak Hill Hospital
Oak Hill | Pediatric Emergency Care Center

B Jeffrey Wallis, MD, PA


Advanced Gastroenterology

6152 W. Corporate Oaks Drive
Crystal River, FL 34429

About B Jeffrey Wallis

B. Jeffrey Wallis, MD is Board Certified in Internal Medicine and Gastroenterology, and received his medical degree from the Joan Sanford I Weill Medical College of Cornell University in 1979.

Dr. Wallis specializes in gastroenterology at Oak Hill Hospital, providing diagnostic and therapeutic management of digestive disease and liver disorders with the most advanced diagnostic and treatment methods for colorectal cancer, heartburn and reflux disease, hiatal hernia, swallowing difficulties, irritable bowel, change in bowel habits, constipation, diarrhea, hemorrhoids, ulcers, colitis, diverticulitis, abdominal pain, liver and gallbladder problems and much more.

Dr. Wallis is a practicing gastroenterologist and hepatologist at Advanced Gastroenterology in Crystal River, Florida. He performs procedures including: capsule enteroscopy, colonoscopy, colorectal cancer screening, chron's disease, ERCP, endoscopic ultrasound, esophageal manometry, flexible sigmoidoscopy, gastroscopy, nutritional therapy, and virtual colonoscopy.


Medical School
Joan Sanford I Weill Medical College of Cornell University

Internal Medicine at University of Michigan in Ann Arbor, Michigan

Internal Medicine at UMDNJ-Rutgers in New Brunswick, New Jersey

Gastroenterology at Stony Brook in Stony Brook, New York

Certifications & Memberships

American Board of Internal Medicine - Gastroenterology; Internal Medicine


American Society for Gastrointestinal Endoscopy; Florida Medical Association; Citrus County Medical Society; American Medical Association; American Gastroenterological Association



Languages Spoken

English, French, Spanish

Procedures & Conditions

Bopsies, Capsule Enteroscopy, Colonoscopy, Colorectal Cancer Screening, Chron's Disease, Diverticular Disease, ERCP, Endoscopic Ultrasound, EGD, Esophageal Manometry, Flexible Sigmoidoscopy, Gastroscopy, GERD, Irritable Bowel Syndrome, Liver Transplant, Nutritional Therapy, Ulcerative Colitis, Virtual Colonoscopy



Sub Specialty

Internal Medicine

Office Locations

Advanced Gastroenterology
6152 W. Corporate Oaks Drive
Crystal River, FL 34429
Phone: (352) 564-3900
Fax: (352) 564-3906

Office Hours

Monday-Friday 9:00 AM-5:00 PM

Accepted Insurance

Medicare, Medicaid, Blue Cross/Blue Shield, Cigna, Aetna, United Healthcare, Avmed, Beechstreet, Coventry, Freedom Health, GHI, Multiplan, Quality Health Plans, Railroad MCR, Tricare For Life, Evolutions, Secure Horizons, Medicare Advantage, Medipass, First Health, Evercare , Universal Healthcare, Medco, Humana, VA, Staywell, Healthease, Optimum, Humana Medicare HMO, United Medicaid/Community Health Plans and Wellcare of Florida.