Dr. Mark Tan, MD
- Medicare services, 2024
- 44,681
- Medicare patients, 2024
- 393
- Part D claims, 2024
- 1,327
- MIPS score, 2024
- 100
- Industry payments
- $27,039
- Practice address
- 222 Middle Country Rd, Smithtown, NY 11787
- Practice phone
- Call (631) 821-5893
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mark Tan, M.D.
Smithtown, New York
Find Dr. Tan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mark Tan is a rheumatologist in Smithtown, New York
Dr. Tan practices at Mark Tan, M.D. in Smithtown, New York.
Dr. Tan's NPI, 1083770580, was assigned on December 29, 2006. Dr. Tan graduated from University at Buffalo School of Medicine in 1983. Dr. Tan holds New York license 165674.
- NPI
- 1083770580NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4789672049
- NPI enumeration date
- December 29, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (631) 821-5893
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Tan practices at Mark Tan, M.D. in Smithtown, New York
Dr. Tan's primary practice is Mark Tan, M.D., at 222 Middle Country Rd, Smithtown, NY 11787 in Suffolk County. The practice phone is (631) 821-5893.
- Mark Tan, M.D.222 Middle Country Rd, Smithtown, NY 11787 · Suffolk CountyPhone(631) 821-5893
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark Tan is affiliated with 2 sites of care
Dr. Tan's primary practice is Mark Tan, M.D. in Smithtown, New York. Dmand AI also links Dr. Tan to 1 physician office, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Mark Tan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mark Tan, M.D. | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Tan is one of 514 rheumatologists in New York
Rheumatology is Dr. Tan's primary specialty in the NPI Registry, under taxonomy code 207RR0500X. Dr. Tan is licensed in New York.
Specialties and state licenses
- Rheumatology, New YorkPrimary
Rheumatologists near Dr. Tan
Counts of rheumatologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark Tan billed Medicare for 44,681 services in 2024
CMS data shows 44,681 Medicare services from Dr. Tan across 25 procedure codes in 2024, for 393 Medicare patients. Medicare paid $675,301 for them. Every service was in an office.
Dr. Tan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 4,9212024: 41,319740%
- Office and hospital visits
- 2023: 1,1862024: 1,2556%
- Tests and treatments
- 2023: 1,1792024: 1,2012%
- Surgery
- 2023: 9852024: 9068%
Dr. Tan compared with the New York median for rheumatologists, 2024
- Dr. Tan
- New York median
- Medicare services
- 44,681vs 56579.1 times
- Medicare patients
- 393vs 1762.2 times
- Part D claims
- 1,065vs 92116% above
Medians across 509 rheumatologists in New York with Dmand AI profiles that report each measure.
Dr. Tan's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Tan treated 393 Medicare patients in 2024, average age 74
CMS counts 393 Medicare patients who saw Dr. Tan in 2024. The largest group is 75 to 84, with 170 patients. 75% of them have arthritis, and 75% have high blood pressure. 5% are also on Medicaid. Their average risk score is 1.36, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tan's median patient age at 68, with 69% women.
Dr. Tan's Medicare patients by age, 2024
Dr. Tan's Medicare patients by sex, 2024
- Women27770%
- Men11630%
Chronic conditions among Dr. Tan's Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease39%
- Osteoporosis36%
- Anxiety33%
- Diabetes32%
- Mood disorders28%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women69%
- Men29%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Tan wrote 1,327 Medicare Part D claims in 2024
In 2024, Dr. Tan wrote 1,327 Medicare Part D claims for 289 patients. 60% of them were for generic drugs. CMS names the drug for 1,065 of them, across 32 drugs with 11 or more claims each, at $2,313,315 in total drug cost. In 2023, CMS named 1,182 claims across 33 drugs.
Dr. Tan's Part D claims by kind of drug, 2024
- Generic791 claims60%
- Brand-name536 claims40%
Dr. Tan's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Tan's Part D claims, 2024
- Opioids2%25 of 1,327 claims
- Antibiotics1%13 of 1,327 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,1822024: 1,06510%
Drugs named by CMS: 32 in 2024, 33 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Mark Tan scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Tan for performance year 2024, reported individually. Dr. Tan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Tan as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Tan's MIPS scores, performance year 2024
- 100of 100Final score
- 100of 100Quality
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Mark Tan received $27,039 in industry payments from 2016 to 2025
CMS Open Payments shows 1,497 general payments to Dr. Tan from 42 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. Janssen Pharmaceuticals, Inc paid the most, $3,840.
General payments to Dr. Tan by program year, 2016 to 2025
General payments to Dr. Tan by kind, 2016 to 2025
- Food and beverage$26,50698%
- Education$5332%
Companies that paid Dr. Tan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Tan graduated from University at Buffalo School of Medicine
Dr. Tan graduated from University at Buffalo School of Medicine in 1983.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark Tan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mark Tan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mark Tan's NPI number?
Dr. Mark Tan's NPI number is 1083770580. It was assigned on December 29, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Tan?
Dr. Mark Tan is a rheumatologist in Smithtown, New York. The primary specialty in the NPI Registry is Rheumatology Physician (taxonomy code 207RR0500X).
Where does Dr. Mark Tan practice?
Dr. Tan practices at 222 Middle Country Rd, Smithtown, NY 11787. Dr. Tan's primary practice is Mark Tan, M.D. in Smithtown, New York. Dmand AI also links Dr. Tan to 1 physician office.
What is Dr. Mark Tan's office phone number?
The practice phone on file for Dr. Tan is (631) 821-5893.
What is Dr. Mark Tan's medical license number?
Dr. Tan holds New York license 165674.
Does Dr. Mark Tan accept Medicare?
Yes. CMS data shows Dr. Tan billed Medicare for 44,681 services in 2024, and Dr. Tan accepts Medicare assignment.
Does Dr. Mark Tan offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Tan as offering telehealth services.
What is Dr. Mark Tan's MIPS score?
Dr. Tan's MIPS final score for performance year 2024 is 100 out of 100, reported individually.
How many Medicare patients does Dr. Mark Tan see?
CMS counts 393 Medicare patients who saw Dr. Tan in 2024, with an average age of 74.
What services does Dr. Mark Tan bill to Medicare?
In 2024, Dr. Tan's most billed Medicare services were injected or infused drug (J1010), injected or infused drug (J9312) and injected or infused drug (J0897).
Show 4 more questionsShow fewer questions
Where did Dr. Mark Tan go to medical school?
Dr. Tan graduated from University at Buffalo School of Medicine in 1983.
What drugs does Dr. Mark Tan prescribe most?
In 2024 Medicare Part D data, Dr. Tan's most prescribed drugs by claims were Prednisone, Actemra and Prolia.
Has Dr. Mark Tan received payments from drug or device companies?
CMS Open Payments shows $27,039 in general payments to Dr. Tan from 42 companies from 2016 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Mark Tan been practicing?
Dr. Tan graduated from medical school in 1983, 43 years ago.
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