Karen Olivia Callahan, ARNP
NPI 1538671672ActiveIndividual· Nurse Practitioner· Lady Lake, FL
Nurse Practitioner (ARNP) with Legacy Healthcare Services Inc and 2 other groups, practicing in Lady Lake, Florida. Their prescriptions cost Medicare Part D more than their services did: $493,848 for 6,799 claims, against $114,302 paid for services in 2024. Exact Sciences Corporation was the largest of 7 companies reporting payments in 2025, $274.78 in all, mostly food and beverage. Lists Villages Regional Hospital, the as a hospital affiliation.
Overview
| NPI | 1538671672 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | ARNP |
| Sole proprietor | Yes |
| NPI issued | Oct 30, 2017 |
| Last updated in NPPES | Mar 17, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 9249882 | FL |
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 - Nurse Practitioner (FL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 551 |
|---|---|
| Services billed | 1,989 across 35 procedure codes |
| Paid by Medicare | $114,302 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,799 · 17,870 30-day fills |
|---|---|
| Patients | 785 |
| Total drug cost | $493,848 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical groups
- Legacy Healthcare Services IncGreenville, SC · 3,223 clinicians
- Cora Health Services IncThe Villages, FL · 1,136 clinicians
- Family Health Enterprises IncLady Lake, FL · 6 clinicians
Hospital affiliation
- Villages Regional Hospital, theThe Villages, FL
Other facilities
- Concierge Home CareHome health agency · The Villages, FL
Industry payments (Open Payments)
- 2025$274.78 · 13 payments from 7 companies
- 2024$244.68 · 11 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exact Sciences Corporation | $63.41 | 3 |
| Novo Nordisk Inc | $59.90 | 3 |
| Bioventus LLC | $46.51 | 2 |
| Lilly USA, LLC | $35.74 | 2 |
| Boston Scientific Corporation | $30.56 | 1 |
What the 2025 payments were for
- Food and Beverage$274.78 · 13 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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