William Gibson Simpson, M.D.
NPI 1487655346ActiveIndividual· Internal Medicine, Gastroenterology· Kalispell, MT
Internal Medicine, Gastroenterology (M.D.) in Kalispell, Montana, trained at University of Kentucky College of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $737,481 for 1,468 claims, against $98,689 paid for services in 2024. Phathom Pharmaceuticals, Inc. was the largest of 5 companies reporting payments in 2025, $120.60 in all, mostly food and beverage.
Overview
| NPI | 1487655346 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 2, 2005 |
| Last updated in NPPES | Nov 27, 2023 |
| Certified by provider | Jun 29, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 79718 | MT |
| Internal Medicine, Gastroenterology | 207RG0100X | 30937 | OK |
| Internal Medicine, Gastroenterology | 207RG0100X | J5017 | TX |
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 - Gastroenterology (MT); Practitioner - Gastroenterology (OK) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 593 |
|---|---|
| Services billed | 977 across 50 procedure codes |
| Paid by Medicare | $98,689 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,468 · 2,720 30-day fills |
|---|---|
| Patients | 376 |
| Total drug cost | $737,481 |
| Generic share | 91% of claims |
Education and affiliations
| Medical school | University of Kentucky College of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Gastroenterology |
Medical group
- Northeastern Health SystemTahlequah, OK · 103 clinicians
Hospital affiliations
- Cherokee Nation W W Hastings Indian HospitalTahlequah, OK
- Logan Health Medical CenterKalispell, MT
- Northeastern Health SystemTahlequah, OK
Industry payments (Open Payments)
- 2025$120.60 · 8 payments from 5 companies
- 2024$67.91 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Phathom Pharmaceuticals, Inc. | $38.77 | 3 |
| Abbvie Inc. | $32.98 | 2 |
| Intercept Pharmaceuticals, Inc. | $20.19 | 1 |
| Pfizer Inc. | $14.44 | 1 |
| Janssen Biotech, Inc. | $14.22 | 1 |
What the 2025 payments were for
- Food and Beverage$120.60 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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