Dr. Barrett Jeffrey Wallis, MD

Dr. Wallis practices at Advanced Gastroenterology Associates in Crystal River, Florida.

Dr. Wallis' NPI, 1740220938, was assigned on June 7, 2006. Dr. Wallis graduated from Weill Cornell Medicine in 1979. Dr. Wallis holds Florida license ME48685.

Dr. Wallis' primary practice is Advanced Gastroenterology Associates, at 6152 W Corporate Oaks Dr, Crystal River, FL 34429-8722. The practice phone is (352) 564-3900.

Dr. Wallis' primary practice is Advanced Gastroenterology Associates in Crystal River, Florida. Dr. Wallis is also affiliated with Tampa General Hospital Crystal River. The medical group on file is Advanced Gastroenterology. Dmand AI also links Dr. Wallis to 1 more medical group, named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Wallis practices, 2 sites in all. Vendor and product names are available with a free account.

Gastroenterology is Dr. Wallis' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Wallis is board certified in gastroenterology by the American Board of Internal Medicine. Dmand AI has Dr. Wallis' licenses on file in 15 states: Florida, Maine, Ohio, South Carolina, Mississippi, Virginia, North Carolina, Tennessee, Missouri, Arizona, Georgia, Massachusetts, Oklahoma, Michigan and New Jersey.

Dmand AI lists acid reflux, acute gastroduodenitis, chronic indigestion, chronic inflammatory bowel disease (IBD), cirrhosis of the liver, colonoscopy, fatty liver and gastroduodenitis among the conditions Dr. Wallis treats.

CMS data shows 1,182 Medicare services from Dr. Wallis across 17 procedure codes in 2024, for 300 Medicare patients. Medicare paid $110,770 for them.

CMS counts 300 Medicare patients who saw Dr. Wallis in 2024. The largest group is 65 to 74, with 119 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 12% are also on Medicaid. Their average risk score is 2.01, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Wallis' median patient age at 65, with 59% women.

In 2024, Dr. Wallis wrote 847 Medicare Part D claims for 224 patients. 87% of them were for generic drugs. CMS names the drug for 618 of them, across 19 drugs with 11 or more claims each, at $43,258 in total drug cost. In 2023, CMS named 653 claims across 21 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Wallis for performance year 2024, reported individually. Dr. Wallis accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 29 procedures of colonoscopy by Dr. Wallis, more than 53% of the clinicians it reports for that procedure.

CMS Open Payments shows 204 general payments to Dr. Wallis from 37 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 92% of the total. Abbvie Inc. paid the most, $1,021.

Dr. Wallis graduated from Weill Cornell Medicine in 1979. Dr. Wallis is a member of American association for study of liver disease, AGA, ASGE, Citrus county medical society and Florida medical association.

Dr. Wallis is in network with 19 carriers, including Elevance, Excellus BlueCross BlueShield and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 12. Check the plan with the practice before a visit.