Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Darren Peter Mareiniss, MD

Individual provider Emergency Medicine Physician · NPI 1689813909

Dr. Darren Peter Mareiniss, MD practises Emergency Medicine in Baltimore, Maryland. Graduated from New York University School of Medicine in 1999, 27 years ago. Practices with Rwjbh Emergency Medicine Associates, LLC, a 807-clinician group and accepts Medicare assignment. Licensed in Maryland.

Years since qualifying
27
Trained at
New York University School of Medicine
Licensed in
MD
In the registry since
2009
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

9000 Franklin Square Dr
Baltimore, MD 21237-3901 Not confirmed with CMS for 10 years — call before visiting
Phone: (972) 533-2486
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence D0068258 (MD)

Record details

NPI number1689813909
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedFebruary 10, 2009
Last updated in NPPESDecember 24, 2015

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolNEW YORK UNIVERSITY SCHOOL OF MEDICINE
Graduated 1999 (27 years in practice)
Group practice Rwjbh Emergency Medicine Associates, Llc — 807 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients68
Services billed 79 a service is one billed item, such as a visit, a test or a procedure
Average patient age71

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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 $281 3 payments · a meal or drink at a meeting or visit, 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 Rwjbh Emergency Medicine Associates, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 807 clinicians in the practice; 12 are shown here.

Other providers in Baltimore