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

Individual provider Rheumatology Physician · NPI 1083770580

Mr. Mark Tan, MD is a Rheumatology in Smithtown, New York. Graduated from State University of New York at Buffalo School of Medicine in 1983, 43 years ago. Practices as a sole proprietor, accepts Medicare assignment and offers telehealth. Licensed in New York.

Years since qualifying
43
Trained at
State University of New York at Buffalo School of Medicine
Licensed in
NY
In the registry since
2006
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

222 Middle Country Rd Ste 312
Smithtown, NY 11787
Phone: (631) 724-8900
Fax: (631) 724-8901
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Rheumatology Physician (primary) Taxonomy 207RR0500X · Licence 165674 (NY)

Record details

NPI number1083770580
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedDecember 29, 2006
Last updated in NPPESJuly 27, 2011
Mailing address222 Middle Country Road, Suite 312, Smithtown, NY 11787

Medicare enrollment

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

Medicare specialtyRHEUMATOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolSTATE UNIVERSITY OF NEW YORK AT BUFFALO SCHOOL OF MEDICINE
Graduated 1983 (43 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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