NPPES file of Aug 9, 2026

Marc Zelkowitz, M.D.

Nephrology Physician · Englewood, NJ

Marc Zelkowitz, M.D. is a nephrology physician with a practice address in Englewood, New Jersey, and NPI 1609134576, issued on Apr 30, 2012. Check the license (New Jersey 25MA09115900, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1609134576
Name
Marc Zelkowitz
Credential
M.D.
Primary taxonomy
Nephrology Physician 207RN0300X
License number
25MA09115900 NJ
Self-reported in NPPES; status is on the state search
Practice location
300 Grand Ave Ste 101, Englewood, NJ 07631
Phone
(201) 567-5787
Enumerated
Apr 30, 2012
Record last updated
Aug 22, 2025
Fax
(201) 567-7652
Medicare enrollment
Enrolled (PECOS I20120618000528); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest nephrology physician records → All 433 in New Jersey → Look up another NPI →

Also registered at 300 Grand Ave Ste 101

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Samuel Agahiu, MDNephrology Physician1992967020
  2. Jasmeena Amin, APNFamily Nurse Practitioner1225772791
  3. Emmanuelle Gilles, M.D.Nephrology Physician1033321294
  4. Douglas Henick, DMDOrthodontics and Dentofacial Orthopedics Dentistry1902331499
  5. Louis Jan, M.D.Nephrology Physician1831152966
  6. Suyon Yim, NPNurse Practitioner1922564749

Verify Marc Zelkowitz in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
    Search for license 25MA09115900    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the New Jersey license search

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9% fewer Medicare Part D claims than the average nephrology physician in 2024

1,329 Medicare Part D claims for 226 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D.

  1. Marc Zelkowitz1,329
  2. Specialty average1,465

Most prescribed

  1. Farxiga166 claims
  2. Losartan Potassium134 claims
  3. Calcitriol112 claims
  4. Amlodipine Besylate82 claims
  5. Jardiance53 claims
  6. Furosemide49 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $749.88

43 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 8,230 providers of this specialty with any payment received $3,091.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Marc Zelkowitz$749.88
  2. Specialty average$3,091.37

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through 2 group practices

  1. Bergen County Improvement AuthorityParamus, NJ
  2. Bergen Kidney Center PCEnglewood, NJ

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Marc Zelkowitz among 433 nephrology physician records in New Jersey

Marc Zelkowitz, M.D. is one of 433 nephrology physician records with a practice address in New Jersey. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 81% of them.

  • NPI issued2012 · 81% of these records are older, 18% newer
  • In a Medicare fileYes · 88% of these records are
  • In the CMS Doctors and Clinicians fileYes · 78% of these records are
  • Graduated2007 · median 2000 among the 337 with a school on file
  • Record last updated2025 · 62% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Nephrology Physician providers in New Jersey

There are 433 nephrology physician records in New Jersey.

All 433 in New Jersey → Every provider in Englewood → Nephrology Physician nationwide →

The 8 nephrology physician records with the nearest ZIP codes

  1. Mirel Abramovici, M.D.Englewood, NJ 076311215961958
  2. Samuel Agahiu, MDEnglewood, NJ 076311992967020
  3. Deborah Fein, MDEnglewood, NJ 076311013998210
  4. Emmanuelle Gilles, M.D.Englewood, NJ 076311033321294
  5. Gerald Grodstein, MDEnglewood, NJ 076311245211440
  6. Louis Jan, M.D.Englewood, NJ 076311831152966
  7. Austin Pattner, MDEnglewood, NJ 076311639150840
  8. Giana Kristy Ramos, D.O.Englewood, NJ 076311003349325

Common questions

What is Marc Zelkowitz, M.D.'s NPI number?

Marc Zelkowitz, M.D.'s National Provider Identifier (NPI) is 1609134576, issued on Apr 30, 2012. An NPI identifies a provider in billing; it is not a license.

Where is Marc Zelkowitz, M.D. located?

The NPPES record lists a practice address at 300 Grand Ave Ste 101, Englewood, NJ, 07631. Phone: (201) 567-5787. Providers update this record themselves, so call before visiting.

How can I verify Marc Zelkowitz, M.D.'s license?

NPPES lists New Jersey license number 25MA09115900, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Marc Zelkowitz, M.D. prescribe under Medicare Part D?

In 2024, Marc Zelkowitz, M.D. had 1,329 Medicare Part D claims for 226 beneficiaries; the average among nephrology physician prescribers was 1,465. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.