Crystal Rae Marsh-Koca, D.O.
NPI 1528472123ActiveIndividual· Internal Medicine· Warren, MI
Internal Medicine (D.O.) in Warren, Michigan, trained at Michigan State University College of Osteopathic Medicine (class of 2014). Their prescriptions cost Medicare Part D more than their services did: $152,320 for 1,076 claims, against $88,508 paid for services in 2024. Zoll Services LLC (A/K/A Zoll Lifecor Corp) was the largest of 7 companies reporting payments in 2025, $385.88 in all, mostly food and beverage.
Overview
| NPI | 1528472123 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | Yes |
| NPI issued | Jun 12, 2014 |
| Last updated in NPPES | Nov 18, 2025 |
| Certified by provider | Nov 18, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 5101021322 | 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 - Internal Medicine (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 466 |
|---|---|
| Services billed | 1,314 across 29 procedure codes |
| Paid by Medicare | $88,508 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,076 · 2,427 30-day fills |
|---|---|
| Patients | 229 |
| Total drug cost | $152,320 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | Michigan State University College of Osteopathic Medicine |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Cardiovascular Disease (Cardiology) |
Medical groups
- Silver Pine Medical Group PLCSterling Heights, MI · 38 clinicians
- Eastlake Cardiovascular PCSaint Clair Shores, MI · 23 clinicians
- Academic Cardiology Associates, PCRochester Hills, MI · 8 clinicians
Hospital affiliations
- Beaumont Hospital - Grosse PointeGrosse Pointe, MI
- Beaumont Hospital Royal OakRoyal Oak, MI
- Beaumont Hospital, TroyTroy, MI
Industry payments (Open Payments)
- 2025$385.88 · 15 payments from 7 companies
- 2024$246.61 · 8 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $130.97 | 3 |
| Boston Scientific Corporation | $97.39 | 3 |
| Amgen Inc. | $65.33 | 4 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $36.76 | 2 |
| E.R. Squibb & Sons, L.L.C. | $21.83 | 1 |
What the 2025 payments were for
- Food and Beverage$367.03 · 14 payments
- Education$18.85 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 135 internal medicine physicians in Warren · All internal medicine physicians in Michigan