Marc Zelkowitz, M.D.
NPI 1609134576ActiveIndividual· Internal Medicine, Nephrology· Englewood, NJ
Internal Medicine, Nephrology (M.D.) with Bergen County Improvement Authority and 1 other group, practicing in Englewood, New Jersey. Their prescriptions cost Medicare Part D more than their services did: $478,658 for 1,329 claims, against $223,610 paid for services in 2024. Ardelyx, Inc. was the largest of 18 companies reporting payments in 2025, $13,109 in all, mostly speaking and faculty fees. Lists Bergen New Bridge Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1609134576 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 30, 2012 |
| Last updated in NPPES | Aug 22, 2025 |
| Certified by provider | Aug 22, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 25MA09115900 | NJ |
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 - Nephrology (NJ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 593 |
|---|---|
| Services billed | 3,118 across 35 procedure codes |
| Paid by Medicare | $223,610 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,329 · 3,127 30-day fills |
|---|---|
| Patients | 226 |
| Total drug cost | $478,658 |
| Generic share | 69% of claims |
Education and affiliations
| Graduation year | 2007 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Bergen County Improvement AuthorityParamus, NJ · 94 clinicians
- Bergen Kidney Center PCWestwood, NJ · 4 clinicians
Hospital affiliations
- Bergen New Bridge Medical CenterParamus, NJ
- Englewood Hospital and Medical CenterEnglewood, NJ
- Hackensack Meridian Health Pascack Valley MedicalWestwood, NJ
- Hackensack University Medical CenterHackensack, NJ
- Holy Name Medical CenterTeaneck, NJ
Other facilities
- Davita Renal Center of WestwoodDialysis facility · Westwood, NJ
- Fkc TenaflyDialysis facility · Tenafly, NJ
- Fmc EnglewoodDialysis facility · Englewood, NJ
Industry payments (Open Payments)
- 2025$13,109 · 129 payments from 18 companies
- 2024$768.93 · 64 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ardelyx, Inc. | $12,066 | 41 |
| Amgen Inc. | $319.30 | 22 |
| Vifor Pharma, Inc. | $139.09 | 17 |
| Travere Therapeutics, Inc. | $101.46 | 13 |
| Novartis Pharmaceuticals Corporation | $79.89 | 5 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$11,000 · 7 payments
- Food and Beverage$1,829 · 118 payments
- Travel and Lodging$266.05 · 2 payments
- Education$13.66 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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