Johannes L. Zakrzewski, M.D.
Pediatric Hematology & Oncology Physician · Hackensack, NJ
Johannes L. Zakrzewski, M.D. is a pediatric hematology & oncology physician with a practice address in Hackensack, New Jersey, and NPI 1558678615, issued on Sep 9, 2010. Check the license (New Jersey 25MA10439100, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Johannes L. Zakrzewski
- Credential
- M.D.
- Primary taxonomy
- Pediatric Hematology & Oncology Physician 2080P0207X
- License number
- 25MA10439100 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 30 Prospect Ave, Hackensack, NJ 07601
- Phone
- (201) 880-3420
- Enumerated
- Sep 9, 2010
- Record last updated
- Nov 20, 2019 (not updated in 7 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest pediatric hematology & oncology physician records → All 71 in New Jersey → Look up another NPI →
Also registered at 30 Prospect Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Johannes L. Zakrzewski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA10439100Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $4,057.10
3 payments; by number, the most common kind was consulting fee; the largest payer was Beckman Coulter, Inc. The 1,215 providers of this specialty with any payment received $7,404.07 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Johannes L. Zakrzewski among 71 pediatric hematology & oncology physician records in New Jersey
Johannes L. Zakrzewski, M.D. is one of 71 pediatric hematology & oncology physician records with a practice address in New Jersey. 44% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 68% of them.
- NPI issued2010 · 68% of these records are older, 28% newer
- In a Medicare fileYes · 44% of these records are
- In the CMS Doctors and Clinicians fileNo · 15% of these records are
- Record last updated2019 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2080P0207X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pediatric Hematology & Oncology Physician providers in New Jersey
There are 71 pediatric hematology & oncology physician records in New Jersey.
All 71 in New Jersey → Every provider in Hackensack → Pediatric Hematology & Oncology Physician nationwide →
The 8 pediatric hematology & oncology physician records with the nearest ZIP codes
- Burton Appel, MDHackensack, NJ 076011790731925
- Katherine ArmstrongHackensack, NJ 076011194145623
- Christine Camacho-Bydume, M.D.Hackensack, NJ 076011801154265
- Jing Chen, MDHackensack, NJ 076011578862082
- Steven Diamond, M.D.Hackensack, NJ 076011679528764
- Cindy Felici, M.D.Hackensack, NJ 076011134138266
- Alfred Gillio, M.D.Hackensack, NJ 076011588602270
- Beverly Ryan, MDHackensack, NJ 076011982610002
Common questions
What is Johannes L. Zakrzewski, M.D.'s NPI number?
Johannes L. Zakrzewski, M.D.'s National Provider Identifier (NPI) is 1558678615, issued on Sep 9, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Johannes L. Zakrzewski, M.D. located?
The NPPES record lists a practice address at 30 Prospect Ave, Hackensack, NJ, 07601. Phone: (201) 880-3420. Providers update this record themselves, so call before visiting.
How can I verify Johannes L. Zakrzewski, M.D.'s license?
NPPES lists New Jersey license number 25MA10439100, 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.
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.
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.