Quick answers
- Which hospitals does William V. Hahn work at?
- Medicare's official clinician data lists William V. Hahn at 3 hospitals: Goleta Valley Cottage Hospital, Santa Barbara Cottage Hospital and Santa Ynez Valley Cottage Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William V. Hahn see patients?
- Medicare's clinician data lists 1 practice location in Santa Barbara, CA. Call before your visit to confirm the address.
- What is William V. Hahn's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does William V. Hahn accept Medicare assignment?
- Yes. Medicare's clinician data says William V. Hahn accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does William V. Hahn offer telehealth?
- Medicare's clinician data says William V. Hahn offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for William V. Hahn?
- (805) 681-7500, as listed in official Medicare / NPI Registry data.
- What is William V. Hahn's NPI number?
- 1033227582. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William V. Hahn works
Medicare's Facility Affiliation Data lists William V. Hahn at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Goleta Valley Cottage HospitalSanta Barbara, CA · Acute Care Hospital · CCN 050357
- Santa Barbara Cottage HospitalSanta Barbara, CA · Acute Care Hospital · CCN 050396
- Santa Ynez Valley Cottage HospitalSolvang, CA · Critical Access Hospital · CCN 051331
Practice locations
Addresses where William V. Hahn is enrolled with Medicare (CMS data updated 2026-10-02).
- 317 W Pueblo StSanta Barbara, CA 93105 (805) 681‑7500
Group practices
Medicare enrollment lists William V. Hahn as a member of this group (CMS data updated 2026-10-02).
- Sansum Clinic320 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Santa Barbara
Clinicians with the same Medicare primary specialty in Santa Barbara, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Washington School Of Medicine |
| Graduation year | 1971 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1033227582 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians