John Nicholas Harker, DO
NPI 1013026269ActiveIndividual· Orthopaedic Surgery· Largo, FL
Orthopaedic Surgery (DO) in Largo, Florida, trained at Nova Southeastern College of Osteo Medicine (class of 1989). 177 Medicare patients in 2024, $77,494 paid; nearly all of their 339 Part D prescriptions were generic (99%). Smith+nephew, Inc. was the largest of 10 companies reporting payments in 2025, $6,190 in all, mostly food and beverage.
Overview
| NPI | 1013026269 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | Yes |
| NPI issued | Aug 30, 2006 |
| Last updated in NPPES | Sep 12, 2025 |
| Certified by provider | Sep 12, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery Primary | 207X00000X | OS-0006819 | FL |
| Orthopaedic Surgery | 207X00000X | 20A23999 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Orthopedic Surgery (CA); Practitioner - Orthopedic Surgery (FL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 177 |
|---|---|
| Services billed | 610 across 71 procedure codes |
| Paid by Medicare | $77,494 |
Part D prescriptions in 2024
| Prescriptions (claims) | 339 · 363 30-day fills |
|---|---|
| Patients | 151 |
| Total drug cost | $3,589 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | Nova Southeastern College of Osteo Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Orthopedic Surgery |
Medical group
- Paul J Wisniewski DO IncApple Valley, CA · 19 clinicians
Hospital affiliations
- HCA Florida Largo HospitalLargo, FL
- Mease Dunedin HospitalDunedin, FL
- Mercy Medical CenterMerced, CA
- Providence St Mary Medical CenterApple Valley, CA
Other facilities
- Enhabit Home HealthHome health agency · Clearwater, FL
Industry payments (Open Payments)
- 2025$6,190 · 61 payments from 10 companies
- 2024$3,123 · 38 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Smith+nephew, Inc. | $3,350 | 22 |
| Stryker Corporation | $1,537 | 18 |
| Integra Lifesciences Corporation | $554.34 | 3 |
| Depuy Synthes Sales Inc. | $293.77 | 8 |
| Zimmer Biomet Holdings, Inc. | $148.83 | 2 |
What the 2025 payments were for
- Food and Beverage$3,264 · 54 payments
- Travel and Lodging$2,317 · 4 payments
- Long term medical supply or device loan$536.00 · 2 payments
- Education$72.71 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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