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

Dr. Mark David Ewalt, MD

Individual provider Cytopathology Physician · NPI 1497998512

Dr. Mark David Ewalt, MD practises Pathology in New York, New York. Graduated from Columbia University College of Physicians and Surgeons in 2009, 17 years ago. Practices with Memorial Pathology Group, a 98-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California and Colorado.

Years since qualifying
17
Trained at
Columbia University College of Physicians and Surgeons
Licensed in
CA, CO
In the registry since
2009
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

1275 York Ave Dept OF Pathology Box #36
New York, NY 10065
Phone: (212) 639-8137
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 8700 Beverly Blvd, West Hollywood, CA 90048-1804 — (310) 423-4551
  • 12605 E 16th Ave, Aurora, CO 80045-2545 — (720) 848-0000

Specialties & licences

Molecular Genetic Pathology (Pathology) Physician (primary) Taxonomy 207ZP0007X · Licence DR.0058760 (CO)
Cytopathology Physician Taxonomy 207ZC0500X · Licence DR.0058760 (CO)
Hematology (Pathology) Physician Taxonomy 207ZH0000X · Licence A121762 (CA)
Hematology (Pathology) Physician Taxonomy 207ZH0000X · Licence DR.0058760 (CO)

Record details

NPI number1497998512
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 20, 2009
Last updated in NPPESAugust 25, 2021
Certification dateAugust 25, 2021

Medicare enrollment

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

Medicare specialtyPATHOLOGY
Medical schoolCOLUMBIA UNIVERSITY COLLEGE OF PHYSICIANS AND SURGEONS
Graduated 2009 (17 years in practice)
Group practice Memorial Pathology Group — 98 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients858
Services billed 1,082 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Consulting Fee $22,031 4 payments
Travel and Lodging $4,915 4 payments · travel or lodging paid or reimbursed, such as to attend a conference
Food and Beverage $283 2 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. Those with a page here are linked.

Also affiliated with 1 hospital, which CMS identifies by certification number only.

Colleagues at Memorial Pathology Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 98 clinicians in the practice; 12 are shown here.

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