Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mr. Mark Leja, APN

Individual provider Psychiatric/Mental Health Nurse Practitioner · NPI 1669242483

Mr. Mark Leja, APN is a Nurse Practitioner in Elizabeth, New Jersey. Qualified in 2023, 3 years ago. Practices with Barnabas Health Medical Group, PC, a 255-clinician group and accepts Medicare assignment. Licensed in New Jersey.

Years since qualifying
3
Licensed in
NJ
In the registry since
2024
What do these letters mean?
APN — Advanced Practice Nurse
The umbrella title some states use for nurse practitioners and other advanced practice nurses.

See every abbreviation used in this directory →

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Practice location Address checks out

654 E Jersey St
Elizabeth, NJ 07206-1261
Phone: (908) 994-7552
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatric/Mental Health Nurse Practitioner (primary) Taxonomy 363LP0808X · Licence 26NJ14964400 (NJ)

Record details

NPI number1669242483
Entity typeIndividual (Type 1)
GenderMale
Credentials APN
Sole proprietorYes
NPI enumeratedJanuary 3, 2024
Last updated in NPPESMarch 6, 2024
Certification dateJanuary 31, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2023 (3 years in practice)
Group practice Barnabas Health Medical Group, Pc — 255 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $752 41 payments · a meal or drink at a meeting or visit, not a fee
Education $111 1 payment · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Barnabas Health Medical Group, PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 255 clinicians in the practice; 12 are shown here.

Other providers in Elizabeth