William HahnM.D.
Gastroenterology·Santa Barbara, CA
William Hahn, M.D. is a Gastroenterology provider in Santa Barbara, CA affiliated with 2 ambulatory surgery centers in CA, as of July 2026.
- NPI1033227582
- Registered2006
- Centers2
- StateCA
- Class of1971
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Ambulatory surgery centers
Centers whose service lines match this provider’s. Affiliations change; verify independently.
Education
Education on record as of August 2026.
William Hahn at a glance
- Provider
- William Hahn
- Credential
- M.D.
- Specialty
- Gastroenterology
- Procedures
- Gastroenterology CPT codes
- Location
- Santa Barbara, CA
- Medical school
- University of Washington School of Medicine
- Graduated
- 1971
- NPI registered
- 2006
- NPI
- 1033227582
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does William Hahn practice?
William Hahn, M.D. is based in Santa Barbara, CA and is affiliated with 2 ambulatory surgery centers: Santa Barbara Endoscopy Center LLC in Santa Barbara, CA and Sansum Clinic in Santa Barbara, CA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is William Hahn's NPI number?
William Hahn's National Provider Identifier (NPI) is 1033227582, registered in 2006. Specialty on record: Gastroenterology; credential M.D.
Where did William Hahn go to medical school?
William Hahn, M.D. attended University of Washington School of Medicine, graduating in 1971.
How many Gastroenterology providers in California work at ambulatory surgery centers?
547 Gastroenterology surgeons and proceduralists in California are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, William Hahn among them. The California Gastroenterology directory lists each one by city with credential, NPI, and center affiliations.
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