Dr. Mark Tan, MD

Internal Medicine*MaleAge 66

Internal Medicine*

Dr. Mark Tan, MD is an internist in Smithtown, NY and has over 40 years of experience in the medical field. He graduated from State University of New York at Buffalo in 1983. He is affiliated with medical facilities such as Stony Brook University Hospital and Mather Hospital.

Dr. Mark Tan, MD

Practice

222 E Main St Ste 312 Smithtown, NY 11787

At a Glance

  • Area of Expertise
    Dr. Tan specializes in the area of Internal Medicine. See board certifications
  • Practices at Top Hospital
    America's 250 Best Hospitals Award™ See hospitals
  • Hospital Satisfaction
    Patients said they were highly satisfied at this doctor's hospital. See hospitals

Experience Check

Search for experience in a specific area

Insurance Check

Search for your insurance carrier and choose your plan type

Dr. Tan's Reviews

Likelihood to recommend Dr. Tan

3.2

29 ratings, 13 with a written review
5 Star
52%
52%
4 Star
0%
0%
3 Star
7%
7%
2 Star
3%
3%
1 Star
38%
38%

Your trust is our top concern. Learn more.

We monitor all reviews to ensure they comply with our guidelines and don’t include personal information, profanity, libel, defamation, harassment, obscenity or fraud.

All reviews are confirmed and audited before publication, and community members have the ability to flag inappropriate content for further review by our team.

Doctors can not pay for good reviews, nor can they pay to have negative reviews removed.

Any reviews that are deemed fraudulent or violate our guidelines will be removed immediately.

RecentHighestLowestMost Helpful
What went well
No results
What could be improved
  • Didn't explain conditions well
  • Didn't trust the provider's decisions
  • Long wait times
2 people found this helpful
Helpful
Mar 11, 2025
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
  • Appointment scheduling
What could be improved
  • I didn't feel respected
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Staff wasn't friendly
  • Appointment was rushed
  • Didn't trust the provider's decisions
  • Long wait times
4 people found this helpful
Helpful
May 19, 2023
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
  • Long wait times
3 people found this helpful
Helpful
Diana – Feb 18, 2023
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
2 people found this helpful
Helpful
T. Ryan – Aug 23, 2022
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
No results
What could be improved
No results
2 people found this helpful
Helpful
Amanda D. – Oct 22, 2020
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
  • Wait times
What could be improved
  • Difficult to schedule appointment
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Staff wasn't friendly
  • Appointment was rushed
  • Didn't trust the provider's decisions
5 people found this helpful
Helpful
Dec 27, 2019
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
  • Appointment scheduling
  • Appointment wasn't rushed
What could be improved
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Staff wasn't friendly
  • Didn't trust the provider's decisions
  • Long wait times
7 people found this helpful
Helpful
Feb 23, 2019
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
No results
What could be improved
  • Difficult to schedule appointment
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Staff wasn't friendly
  • Appointment was rushed
  • Didn't trust the provider's decisions
  • Long wait times
5 people found this helpful
Helpful
JM in Kings Park – Nov 14, 2017
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
  • Appointment scheduling
  • Wait times
What could be improved
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Staff wasn't friendly
  • Didn't trust the provider's decisions
11 people found this helpful
Helpful
Danielle in Lindenhurst, NY – Nov 12, 2017
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
No results
What could be improved
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Appointment was rushed
  • Didn't trust the provider's decisions
  • Long wait times
6 people found this helpful
Helpful
Patchogue, NY – Apr 30, 2017
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
5 people found this helpful
Helpful
Melodie S – Apr 13, 2017
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
1 person found this helpful
Helpful
HAUPPAUGE,NY – Apr 07, 2017
×Post a ResponseAre you Dr. Mark Tan, MD?
What went well
  • Appointment scheduling
What could be improved
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Staff wasn't friendly
  • Appointment was rushed
  • Didn't trust the provider's decisions
  • Long wait times
22 people found this helpful
Helpful
New York, NY – Aug 05, 2016
×Post a ResponseAre you Dr. Mark Tan, MD?

Leave a review

How was your experience with Dr. Tan?

Is this your profile?

Respond to reviews, add information, and reach more patients. Claiming is free and only takes a minute.

Claim your profile

About Me

biography

Dr. Mark Tan, MD is an internist in Smithtown, NY and has over 40 years of experience in the medical field. He graduated from State University of New York at Buffalo in 1983. He is affiliated with medical facilities such as Stony Brook University Hospital and Mather Hospital.
  • Internal Medicine

*Healthgrades does not verify qualifications for medical specialties. Please verify your provider's specialty and qualifications directly with your provider and applicable medical board.

  • State University Of New York At Buffalo

    Medical School, 1983
American Board of Medical Specialties®
American Board of Internal Medicine®
Internal Medicine
For detailed information about any of the below board actions, please search for the provider's records on the linked state licensing board or the Federation of State Medical Boards. To learn more about the difference between these sources, please refer to our FAQs.
Healthgrades has not received any data indicating a board action exists for this provider.

Online Care for Prescription Refills (Sponsored)

Locations

Practice

Mark Tan M.D. PC222 E Main St Ste 312 Smithtown, NY 11787
1

Affiliated Hospitals

  • Mather Hospital

    75 N Country Rd
    Port Jefferson, NY 11777
    Recipient of 22
    hospital awards

    America's 250 Best Hospitals Award™ (2025, 2024, 2023)

    Top 5% in the nation for consistently delivering clinical quality

    Outstanding Patient Experience Award™ (2024, 2023, 2022)

    Top 5% in the nation for consistently delivering clinical quality

    View all awards

    How patients felt about the care they received at this hospital.

    90%
    Patients said they were given information about recovering at home

    6% higher than the national average

    85%
    Patients said that nurses always listened to them and explained things well

    10% higher than the national average

    View all patient feedback
  • St Charles Hospital

    200 Belle Terre Rd
    Port Jefferson, NY 11777
    Recipient of 1
    hospital award

    How patients felt about the care they received at this hospital.

    86%
    Patients said they were given information about recovering at home

    2% higher than the national average

    77%
    Patients said that nurses always listened to them and explained things well

    2% higher than the national average

    View all patient feedback
  • Stony Brook University Hospital

    101 Nicolls Rd
    Stony Brook, NY 11794
    Recipient of 33
    hospital awards

    America's 100 Best Hospitals Award™ (2025, 2024, 2023)

    Top 5% in the nation for consistently delivering clinical quality

    America's 250 Best Hospitals Award™ (2025, 2024, 2023)

    Top 5% in the nation for consistently delivering clinical quality

    View all awards

    How patients felt about the care they received at this hospital.

    86%
    Patients said they were given information about recovering at home

    2% higher than the national average

    74%
    Patients said that doctors always listened to them and explained things well

    2% lower than the national average

    View all patient feedback
Learn more about how Healthgrades measures Hospital Quality