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

Dr. Mason Marcus, MD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1003300617

Dr. Mason Marcus, MD practises Internal Medicine in Dallas, Texas. Graduated from University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb) in 2018, 8 years ago. Licensed in Massachusetts, New Mexico and Texas.

Years since qualifying
8
Trained at
University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb)
Licensed in
MA, NM, TX
In the registry since
2018
Specialties on file
4
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

Student / training record This NPI belongs to someone enrolled in a health care training programme. It carries no licence and no practice of its own, so no address or phone number is published for it.

Dallas, TX

No coordinates on file. Search this address in Google Maps

Specialties & licences

Clinical Cardiac Electrophysiology Physician (primary) Taxonomy 207RC0001X · Licence MD2026-0339 (NM)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X · Licence 276344 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence T5387 (TX)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence MD2026-0339 (NM)

Record details

NPI number1003300617
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 18, 2018
Last updated in NPPESSeptember 28, 2026
Certification dateSeptember 28, 2026

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolUNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB)
Graduated 2018 (8 years in practice)
Accepts Medicare assignment Not indicated

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.

Travel and Lodging $1,552 8 payments · travel or lodging paid or reimbursed, such as to attend a conference
Food and Beverage $1,270 27 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.

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