Douglas Allen Horstmanshof, MD
NPI 1881688760ActiveIndividual· Internal Medicine, Cardiovascular Disease· Royal Oak, MI
Internal Medicine, Cardiovascular Disease (MD) with Beaumont Medical Group- Specialty Services, practicing in Royal Oak, Michigan. Their prescriptions cost Medicare Part D more than their services did: $785,332 for 1,640 claims, against $39,788 paid for services in 2024. Alnylam Pharmaceuticals Inc. was the largest of 10 companies reporting payments in 2025, $75,557 in all, mostly speaking and faculty fees. Lists Beaumont Hospital - Farmington Hills and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1881688760 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Sep 7, 2005 |
| Last updated in NPPES | Jul 22, 2024 |
| Certified by provider | Jul 22, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | 4301511619 | MI |
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 - Cardiovascular Disease (Cardiology) (MI); Practitioner - Cardiovascular Disease (Cardiology) (OK) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 244 |
|---|---|
| Services billed | 600 across 36 procedure codes |
| Paid by Medicare | $39,788 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,640 · 3,515 30-day fills |
|---|---|
| Patients | 275 |
| Total drug cost | $785,332 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 1996 |
|---|---|
| Medicare specialty | Cardiovascular Disease (Cardiology) |
Medical group
- Beaumont Medical Group- Specialty ServicesBerkley, MI · 847 clinicians
Hospital affiliations
- Beaumont Hospital - Farmington HillsFarmington Hills, MI
- Beaumont Hospital Royal OakRoyal Oak, MI
- Beaumont Hospital, TroyTroy, MI
- Integris Baptist Medical Center, IncOklahoma City, OK
Industry payments (Open Payments)
- 2025$75,557 · 99 payments from 10 companies
- 2024$71,190 · 96 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alnylam Pharmaceuticals Inc. | $28,868 | 20 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $19,172 | 12 |
| Abbott Laboratories | $18,601 | 42 |
| Lilly USA, LLC | $5,250 | 4 |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $1,821 | 4 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$51,600 · 17 payments
- Consulting Fee$12,150 · 12 payments
- Travel and Lodging$8,622 · 32 payments
- Food and Beverage$3,185 · 38 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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