Kathryn Grinnen, DO
NPI 1710102124ActiveIndividual· Internal Medicine· Lewes, DE
Internal Medicine (DO) in Lewes, Delaware, trained at Lake Erie College of Osteopathic Medicine, Erie (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $748,620 for 4,612 claims, against $131,527 paid for services in 2024. Amgen Inc. reported $20.00 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1710102124 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Apr 13, 2007 |
| Last updated in NPPES | Feb 10, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | C2-0009051 | DE |
| Internal Medicine | 207R00000X | 58002204 | OH |
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 (DE) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 262 |
|---|---|
| Services billed | 2,551 across 46 procedure codes |
| Paid by Medicare | $131,527 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,612 · 9,847 30-day fills |
|---|---|
| Patients | 436 |
| Total drug cost | $748,620 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Lake Erie College of Osteopathic Medicine, Erie |
|---|---|
| Graduation year | 2006 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Core Concierge Primary Care and Wellness LLCRehoboth Beach, DE · 3 clinicians
Hospital affiliations
- Bayhealth Hospital, Sussex CampusMilford, DE
- Beebe Medical CenterLewes, DE
Other facilities
- Aveanna Home HealthcareHome health agency · Milford, DE
- Beebe Hospital Home HealthHome health agency · Millsboro, DE
Industry payments (Open Payments)
- 2025$20.00 · 1 payment from 1 company
- 2024$115.80 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $20.00 | 1 |
What the 2025 payments were for
- Food and Beverage$20.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 56 internal medicine physicians in Lewes · All internal medicine physicians in Delaware