Mark Tan, M.D.
Rheumatology Physician · Smithtown, NY
Mark Tan, M.D. is a rheumatology physician with a practice address in Smithtown, New York, and NPI 1083770580, issued on Dec 29, 2006. Check the license (New York 165674, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark Tan
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 165674 NY
Self-reported in NPPES; status is on the state search - Practice location
- 222 Middle Country Road, Smithtown, NY 11787
- Phone
- (631) 724-8900
- Enumerated
- Dec 29, 2006
- Record last updated
- Jul 27, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (631) 724-8901
- Medicaid ID
- 00986705 NY
- Medicare enrollment
- Enrolled (PECOS I20040504001748); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Buffalo School Of Medicine, 1983
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 599 in New York → Look up another NPI →
Also registered at 222 Middle Country Road
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Tan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 165674Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average rheumatology physician in 2024
1,327 Medicare Part D claims for 289 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 40% of claims. 25 claims were for opioids.
Most prescribed
- Prednisone154 claims
- Actemra90 claims
- Prolia88 claims
- Gabapentin82 claims
- Hydroxychloroquine Sulfate54 claims
- Rinvoq46 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 0 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $3,014.07
142 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, Inc. The 4,486 providers of this specialty with any payment received $8,538.33 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Mark Tan among 599 rheumatology physician records in New York
Mark Tan, M.D. is one of 599 rheumatology physician records with a practice address in New York. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1983 · median 2003 among the 425 with a school on file
- Record last updated2011 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in New York
There are 599 rheumatology physician records in New York.
All 599 in New York → Every provider in Smithtown → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Howard Blumstein, M.D.Smithtown, NY 117871598751471
- Sara Johnson, M.D.Smithtown, NY 117871043206964
- Kristin Macdougall, MDSmithtown, NY 117871093000325
- Luiziana Marinescu, M.D.Smithtown, NY 117871790978096
- Peter Rumore, M.D.Smithtown, NY 117871245226109
- Ashmia Saif, D.O.Smithtown, NY 117871821594581
- Paul Schulman, M.D.Smithtown, NY 117871639165541
- Daniel Torres Leyva, M.DSmithtown, NY 117871619388667
Common questions
What is Mark Tan, M.D.'s NPI number?
Mark Tan, M.D.'s National Provider Identifier (NPI) is 1083770580, issued on Dec 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Tan, M.D. located?
The NPPES record lists a practice address at 222 Middle Country Road, Smithtown, NY, 11787. Phone: (631) 724-8900. Providers update this record themselves, so call before visiting.
How can I verify Mark Tan, M.D.'s license?
NPPES lists New York license number 165674, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Tan, M.D. prescribe under Medicare Part D?
In 2024, Mark Tan, M.D. had 1,327 Medicare Part D claims for 289 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Mark Tan, M.D.'s MIPS final score?
The 2023 MIPS final score is 0 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.