William B. Gunderson IV, MD
NPI 1205151990ActiveIndividual· Internal Medicine· Friday Harbor, WA
Internal Medicine (MD) in Friday Harbor, Washington, trained at Tulane University School of Medicine (class of 2010). Their prescriptions cost Medicare Part D more than their services did: $763,032 for 7,116 claims, against $3,044 paid for services in 2024. Dexcom, Inc. reported $13.80 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1205151990 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 6, 2010 |
| Last updated in NPPES | Jul 30, 2024 |
| Certified by provider | Jul 30, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | MD60476325 | WA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 14 |
|---|---|
| Services billed | 42 across 10 procedure codes |
| Paid by Medicare | $3,044 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,116 · 15,756 30-day fills |
|---|---|
| Patients | 665 |
| Total drug cost | $763,032 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | Tulane University School of Medicine |
|---|---|
| Graduation year | 2010 |
| Medicare specialty | Internal Medicine |
Medical group
- PeacehealthFriday Harbor, WA · 6 clinicians
Hospital affiliations
- Island HospitalAnacortes, WA
- Peacehealth Peace Island Medical CenterFriday Harbor, WA
- Peacehealth St Joseph Medical CenterBellingham, WA
- Peacehealth United General Medical CenterSedro Woolley, WA
Other facilities
- Alpha Home HealthHome health agency · Everett, WA
- Hospice of the NorthwestHospice · Mount Vernon, WA
Industry payments (Open Payments)
- 2025$13.80 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Dexcom, Inc. | $13.80 | 1 |
What the 2025 payments were for
- Food and Beverage$13.80 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine providers in Friday Harbor
- 1588873137