Gregorio Tan, MD
NPI 1316926751ActiveIndividual· Internal Medicine, Cardiovascular Disease· Kalamazoo, MI
Internal Medicine, Cardiovascular Disease (MD) with Ascension Medical Group Promed and 1 other group, practicing in Kalamazoo, Michigan. Their prescriptions cost Medicare Part D more than their services did: $633,568 for 2,970 claims, against $56,951 paid for services in 2024. Novartis Pharmaceuticals Corporation was the largest of 8 companies reporting payments in 2025, $247.58 in all, mostly food and beverage. Lists Borgess Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1316926751 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 13, 2006 |
| Last updated in NPPES | Jul 13, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | 4301067381 | MI |
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 - Cardiovascular Disease (Cardiology) (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 719 |
|---|---|
| Services billed | 1,270 across 27 procedure codes |
| Paid by Medicare | $56,951 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,970 · 7,502 30-day fills |
|---|---|
| Patients | 479 |
| Total drug cost | $633,568 |
| Generic share | 80% of claims |
Education and affiliations
| Graduation year | 1979 |
|---|---|
| Medicare specialty | Cardiovascular Disease (Cardiology) |
Medical groups
- Ascension Medical Group PromedKalamazoo, MI · 262 clinicians
- Ascension Borgess HospitalKalamazoo, MI · 37 clinicians
Hospital affiliations
- Borgess Medical CenterKalamazoo, MI
- Bronson Methodist HospitalKalamazoo, MI
- Insight Hospital and Medical Center ColdwaterColdwater, MI
- Oaklawn HospitalMarshall, MI
- Three Rivers HealthThree Rivers, MI
Industry payments (Open Payments)
- 2025$247.58 · 12 payments from 8 companies
- 2024$116.37 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novartis Pharmaceuticals Corporation | $54.63 | 3 |
| E.R. Squibb & Sons, L.L.C. | $48.10 | 3 |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $41.53 | 1 |
| Novo Nordisk Inc | $27.69 | 1 |
| Atricure, Inc. | $26.76 | 1 |
What the 2025 payments were for
- Food and Beverage$247.58 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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