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

Mark A Gelfand, MD

Individual provider Plastic Surgery Physician · NPI 1659546992

Mark A Gelfand, MD practises Plastic and Reconstructive Surgery in East Setauket, New York. Graduated from State University of Ny Upstate Medical University in 2000, 26 years ago. Practices with Legacy Clinics LLC, a 718-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
26
Trained at
State University of Ny Upstate Medical University
Licensed in
NY
In the registry since
2008
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

24 Research Way
East Setauket, NY 11733-3487 Not confirmed with CMS for 18 years — call before visiting
Phone: (631) 444-4666
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Plastic Surgery Physician (primary) Taxonomy 208200000X · Licence 234242 (NY)

Record details

NPI number1659546992
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 28, 2008
Last updated in NPPESApril 28, 2008

Medicare enrollment

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

Medicare specialtyPLASTIC AND RECONSTRUCTIVE SURGERY
Medical schoolSTATE UNIVERSITY OF NY UPSTATE MEDICAL UNIVERSITY
Graduated 2000 (26 years in practice)
Group practice Legacy Clinics Llc — 718 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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.

Mastectomy 1–10 times
Melanoma (skin cancer) excision 1–10 times
Removal of tissue 1–10 times

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 patients143
Services billed 779 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

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 Legacy Clinics LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 718 clinicians in the practice; 12 are shown here.

Other providers in East Setauket