William V. Hahn, M.D.
NPI 1033227582ActiveIndividual· Internal Medicine, Gastroenterology· Santa Barbara, CA
Internal Medicine, Gastroenterology (M.D.) in Santa Barbara, California, trained at University of Washington School of Medicine (class of 1971). Their prescriptions cost Medicare Part D more than their services did: $490,446 for 1,888 claims, against $155,510 paid for services in 2024. Abbvie Inc. was the largest of 11 companies reporting payments in 2025, $858.38 in all, mostly food and beverage.
Overview
| NPI | 1033227582 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 25, 2006 |
| Last updated in NPPES | May 21, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | G24182 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 736 |
|---|---|
| Services billed | 2,571 across 54 procedure codes |
| Paid by Medicare | $155,510 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,888 · 3,073 30-day fills |
|---|---|
| Patients | 769 |
| Total drug cost | $490,446 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | University of Washington School of Medicine |
|---|---|
| Graduation year | 1971 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Sansum ClinicSanta Barbara, CA · 320 clinicians
Hospital affiliations
- Goleta Valley Cottage HospitalSanta Barbara, CA
- Santa Barbara Cottage HospitalSanta Barbara, CA
- Santa Ynez Valley Cottage HospitalSolvang, CA
Industry payments (Open Payments)
- 2025$858.38 · 41 payments from 11 companies
- 2024$318.88 · 19 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $349.29 | 19 |
| Janssen Biotech, Inc. | $114.16 | 4 |
| Madrigal Pharmaceuticals | $70.67 | 4 |
| Aimmune Therapeutics, Inc. | $69.26 | 3 |
| Pfizer Inc. | $66.74 | 3 |
What the 2025 payments were for
- Food and Beverage$858.38 · 41 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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