John K. Oppenheimer, M.D.
NPI 1659364214ActiveIndividual· Internal Medicine· Sag Harbor, NY
Internal Medicine (M.D.) in Sag Harbor, New York, trained at Tulane University School of Medicine (class of 1981). Their prescriptions cost Medicare Part D more than their services did: $795,620 for 3,958 claims, against $59,798 paid for services in 2024. Aquestive Therapeutics, Inc. was the largest of 2 companies reporting payments in 2025, $6,121 in all, mostly consulting fees.
Overview
| NPI | 1659364214 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Aug 29, 2005 |
| Last updated in NPPES | Aug 21, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 150853 | 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 - Internal Medicine (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 197 |
|---|---|
| Services billed | 793 across 14 procedure codes |
| Paid by Medicare | $59,798 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,958 · 8,124 30-day fills |
|---|---|
| Patients | 216 |
| Total drug cost | $795,620 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Tulane University School of Medicine |
|---|---|
| Graduation year | 1981 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Geriatric Medicine |
Hospital affiliation
- Suny/Stony Brook University HospitalStony Brook, NY
Industry payments (Open Payments)
- 2025$6,121 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Aquestive Therapeutics, Inc. | $6,000 | 1 |
| Astrazeneca Pharmaceuticals LP | $120.97 | 1 |
What the 2025 payments were for
- Consulting Fee$6,000 · 1 payment
- Food and Beverage$120.97 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Sag Harbor
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