James Brad Diestelhorst, M.D.
NPI 1336148766ActiveIndividual· Internal Medicine, Pulmonary Disease· Bellingham, WA
Internal Medicine, Pulmonary Disease (M.D.) in Bellingham, Washington, trained at University of Missouri, Columbia School of Medicine (class of 1996). Their prescriptions cost Medicare Part D more than their services did: $1,366,080 for 1,129 claims, against $64,409 paid for services in 2024. Actelion Pharmaceuticals US, Inc. was the largest of 3 companies reporting payments in 2025, $96.29 in all, mostly food and beverage.
Overview
| NPI | 1336148766 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 18, 2005 |
| Last updated in NPPES | Sep 22, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | MD00041071 | WA |
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 - Pulmonary Disease (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 600 |
|---|---|
| Services billed | 1,627 across 33 procedure codes |
| Paid by Medicare | $64,409 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,129 · 1,852 30-day fills |
|---|---|
| Patients | 313 |
| Total drug cost | $1,366,080 |
| Generic share | 47% of claims |
Education and affiliations
| Medical school | University of Missouri, Columbia School of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Pulmonary Disease |
| Secondary specialties | Critical Care (Intensivists), Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- PeacehealthBellingham, WA · 298 clinicians
Hospital affiliations
- Peacehealth St Joseph Medical CenterBellingham, WA
- Peacehealth United General Medical CenterSedro Woolley, WA
Industry payments (Open Payments)
- 2025$96.29 · 4 payments from 3 companies
- 2024$38.86 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Actelion Pharmaceuticals US, Inc. | $51.38 | 2 |
| Insmed, Inc. | $25.28 | 1 |
| Genzyme Corporation | $19.63 | 1 |
What the 2025 payments were for
- Food and Beverage$96.29 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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