David P. Chamberlain, M.D.
NPI 1861423071ActiveIndividual· Internal Medicine· Butte, MT
Internal Medicine (M.D.) in Butte, Montana, trained at University of Missouri, Columbia School of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $818,920 for 8,979 claims, against $146,855 paid for services in 2024. Abbvie Inc. was the largest of 17 companies reporting payments in 2025, $1,150 in all, mostly food and beverage.
Overview
| NPI | 1861423071 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 5, 2006 |
| Last updated in NPPES | Jan 11, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 9601 | MT |
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 - Internal Medicine (MT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 419 |
|---|---|
| Services billed | 6,552 across 71 procedure codes |
| Paid by Medicare | $146,855 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,979 · 20,801 30-day fills |
|---|---|
| Patients | 423 |
| Total drug cost | $818,920 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | University of Missouri, Columbia School of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Internal Medicine |
Medical group
- Mercury Street Medical Group PLLCButte, MT · 6 clinicians
Hospital affiliations
- Community Hospital of AnacondaAnaconda, MT
- St James HospitalButte, MT
Other facilities
- Compassus Home Health - ButteHome health agency · Butte, MT
- Enhabit Home HealthHome health agency · Helena, MT
Industry payments (Open Payments)
- 2025$1,150 · 68 payments from 17 companies
- 2024$1,683 · 101 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $239.79 | 13 |
| Pfizer Inc. | $181.77 | 6 |
| Astrazeneca Pharmaceuticals LP | $160.70 | 19 |
| Amgen Inc. | $150.91 | 9 |
| Novartis Pharmaceuticals Corporation | $52.81 | 2 |
What the 2025 payments were for
- Food and Beverage$1,150 · 68 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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