William M. Klein, MD
NPI 1659359578ActiveIndividual· Internal Medicine· New Hyde Park, NY
Internal Medicine (MD) in New Hyde Park, New York, trained at Icahn School of Medicine at Mount Sinai (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $473,112 for 3,149 claims, against $214,593 paid for services in 2024. Antares Pharma, Inc. was the largest of 20 companies reporting payments in 2025, $1,782 in all, mostly food and beverage.
Overview
| NPI | 1659359578 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 3, 2006 |
| Last updated in NPPES | Aug 6, 2026 |
| Certified by provider | Aug 6, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 205508 | 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 - General Practice (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 213 |
|---|---|
| Services billed | 8,340 across 62 procedure codes |
| Paid by Medicare | $214,593 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,149 · 6,894 30-day fills |
|---|---|
| Patients | 204 |
| Total drug cost | $473,112 |
| Generic share | 82% of claims |
Education and affiliations
| Medical school | Icahn School of Medicine at Mount Sinai |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | General Practice |
| Telehealth | Offers telehealth |
Medical group
- North Shore Primary Care Medical Associates PCGreat Neck, NY · 5 clinicians
Hospital affiliation
- North Shore University HospitalManhasset, NY
Industry payments (Open Payments)
- 2025$1,782 · 90 payments from 20 companies
- 2024$1,663 · 98 payments from 22 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Antares Pharma, Inc. | $230.48 | 9 |
| Lilly USA, LLC | $193.27 | 10 |
| Pfizer Inc. | $184.57 | 14 |
| Astrazeneca Pharmaceuticals LP | $159.13 | 16 |
| Abbvie Inc. | $144.15 | 9 |
What the 2025 payments were for
- Food and Beverage$1,782 · 90 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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