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

Mark Stephen Lemert, MD

Individual provider Gastroenterology Physician · NPI 1306810478

Mark Stephen Lemert, MD practises Gastroenterology in New York, New York. Graduated from George Washington University School of Medicine in 1997, 29 years ago. Practices with New York University, a 5,884-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Maine and New York.

Years since qualifying
29
Trained at
George Washington University School of Medicine
Licensed in
ME, NY
In the registry since
2006
Specialties on file
2
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

317 E 34th St Murray Hill Medical Group 7th Fl
New York, NY 10016-4974
Phone: (212) 726-7412
Fax: (212) 981-7212
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 4 Glen Cove Dr Ste 10, Rockport, ME 04856 — (207) 301-5790

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence MD26758 (ME)
Gastroenterology Physician Taxonomy 207RG0100X · Licence 236488 (NY)

Record details

NPI number1306810478
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 15, 2006
Last updated in NPPESFebruary 20, 2024
Certification dateFebruary 20, 2024

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolGEORGE WASHINGTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 1997 (29 years in practice)
Group practice New York University — 5884 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 60 times · 67th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 42 times · 61st percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients255
Services billed 575 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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at New York University

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 5884 clinicians in the practice; 12 are shown here.

Other providers in New York