Dr. William V. Hahn, MD

Dr. Hahn practices at Sansum Clinic in Santa Barbara, California.

Dr. Hahn's NPI, 1033227582, was assigned on August 25, 2006. Dr. Hahn graduated from University Of Washington School Of Medicine in 1971. Dr. Hahn holds California license G24182.

Dr. Hahn's primary practice is Sansum Clinic, at 317 West Pueblo, Santa Barbara, CA 93105. The practice phone is (805) 681-7500.

Dr. Hahn's primary practice is Sansum Clinic in Santa Barbara, California. Dr. Hahn is also affiliated with Santa Barbara Cottage Hospital. The medical group on file is Sansum Clinic. Dmand AI also links Dr. Hahn to 2 more hospitals, each named with a free account. Dr. Hahn's employer is on file too: a surgery center (asc).

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hahn practices, 4 sites in all. Vendor and product names are available with a free account.

Gastroenterology is Dr. Hahn's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Hahn is board certified in gastroenterology by the American Board of Internal Medicine. Dr. Hahn is licensed in California.

Dmand AI lists acid reflux, chronic inflammatory bowel disease (IBD), cirrhosis of the liver, colonoscopy, fatty liver, gastroenteritis, gastrointestinal bleeding and intestinal diverticulosis among the conditions Dr. Hahn treats.

CMS data shows 1,494 Medicare services from Dr. Hahn across 16 procedure codes in 2024, for 736 Medicare patients. Medicare paid $129,035 for them.

CMS counts 736 Medicare patients who saw Dr. Hahn in 2024. The largest group is 65 to 74, with 390 patients. 73% of them have high cholesterol, and 61% have high blood pressure. 17% are also on Medicaid. Their average risk score is 1.13, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Dr. Hahn's median patient age at 69, with 53% women.

In 2024, Dr. Hahn wrote 1,888 Medicare Part D claims for 769 patients. 85% of them were for generic drugs. CMS names the drug for 1,595 of them, across 28 drugs with 11 or more claims each, at $214,043 in total drug cost. In 2023, CMS named 1,805 claims across 37 drugs.

Dr. Hahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Hahn as offering telehealth. CMS counts 220 procedures of colonoscopy by Dr. Hahn, more than 95% of the clinicians it reports for that procedure.

Dmand AI links 3 papers to Dr. Hahn. The most frequent topics are Antibody-Dependent Cell Cytotoxicity, Cell Line and Colonic Neoplasms. Dr. Hahn's most frequent co-authors are James V. Egan, MD and John L. Petrini, MD.

CMS Open Payments shows 561 general payments to Dr. Hahn from 34 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $1,965.

Dmand AI lists 1 award for Dr. Hahn, most recently CMS Stage 1 EHR in 2013.

Dr. Hahn graduated from University Of Washington School Of Medicine in 1971.

Dr. Hahn is in network with 12 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.