Mark T. De Boer, MD
NPI 1548331440ActiveIndividual· Internal Medicine, Cardiovascular Disease· Anaheim, CA
Internal Medicine, Cardiovascular Disease (MD) with Billings Clinic Specialty Supplies and Services, LLC and 1 other group, practicing in Anaheim, California. Mostly services rather than prescriptions: Medicare paid $6,499 for 73 patients in 2024, with only 37 Part D claims. Sanofi-Aventis U.S. LLC was the largest of 3 companies reporting payments in 2025, $3,735 in all, mostly consulting fees. Lists Billings Clinic Hospital and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1548331440 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 13, 2006 |
| Last updated in NPPES | Sep 25, 2024 |
| Certified by provider | Sep 25, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | 145447 | MT |
| Internal Medicine, Interventional Cardiology | 207RI0011X | G59873 | CA |
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 (CA); Practitioner - Cardiovascular Disease (Cardiology) (MT); Practitioner - Cardiovascular Disease (Cardiology) (WY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 73 |
|---|---|
| Services billed | 103 across 14 procedure codes |
| Paid by Medicare | $6,499 |
Part D prescriptions in 2024
| Prescriptions (claims) | 37 · 101 30-day fills |
|---|---|
| Patients | 32 |
| Total drug cost | $2,628 |
| Generic share | 92% of claims |
Education and affiliations
| Graduation year | 1985 |
|---|---|
| Medicare specialty | Cardiovascular Disease (Cardiology) |
Medical groups
- Billings Clinic Specialty Supplies and Services, LLCBillings, MT · 824 clinicians
- Livingston HealthcareWilsall, MT · 67 clinicians
Hospital affiliations
- Billings Clinic HospitalBillings, MT
- Bozeman Health Deaconess HospitalBozeman, MT
- Livingston HealthcareLivingston, MT
- Ruby Valley Medical CenterSheridan, MT
Industry payments (Open Payments)
- 2025$3,735 · 6 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sanofi-Aventis U.S. LLC | $3,559 | 2 |
| Abbott Laboratories | $121.06 | 1 |
| Novartis Pharmaceuticals Corporation | $54.39 | 3 |
What the 2025 payments were for
- Consulting Fee$3,435 · 1 payment
- Food and Beverage$299.69 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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