John K. Maesaka, M.D.
NPI 1417911686ActiveIndividual· Internal Medicine, Nephrology· Mineola, NY
Internal Medicine, Nephrology (M.D.) in Mineola, New York, trained at Boston University School of Medicine (class of 1961). Their prescriptions cost Medicare Part D more than their services did: $144,870 for 656 claims, against $27,313 paid for services in 2024. Amgen Inc. reported $20.19 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1417911686 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Apr 14, 2006 |
| Last updated in NPPES | Mar 7, 2023 |
| Certified by provider | Feb 23, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 100559 | NY |
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 - Nephrology (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 85 |
|---|---|
| Services billed | 680 across 14 procedure codes |
| Paid by Medicare | $27,313 |
Part D prescriptions in 2024
| Prescriptions (claims) | 656 · 1,637 30-day fills |
|---|---|
| Patients | 102 |
| Total drug cost | $144,870 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | Boston University School of Medicine |
|---|---|
| Graduation year | 1961 |
| Medicare specialty | Nephrology |
Medical group
- New York UniversityNew York, NY · 6,134 clinicians
Industry payments (Open Payments)
- 2025$20.19 · 1 payment from 1 company
- 2024$28.31 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $20.19 | 1 |
What the 2025 payments were for
- Food and Beverage$20.19 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 26 nephrologists in Mineola · All nephrologists in New York