Dr. Kostas Sideridis, DO

Gastroenterology*MaleAge 52

Gastroenterology*

Dr. Kostas Sideridis, DO is a gastroenterologist in Syosset, NY. Dr. Sideridis has extensive experience in Gastrointestinal Disorders, Esophageal Disorders, and Pancreatic Disease. He is affiliated with medical facilities such as Long Island Jewish Medical Center and North Shore University Hospital. He is accepting new patients and telehealth appointments.

Dr. Kostas Sideridis, DO

Long Island Medical PC

237 Jericho Tpke Syosset, NY 11791
Telehealth availableTelehealth services available
Telehealth availableTelehealth services available
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Accepting new patients

Hospital Highlight

Dr. Sideridis is affiliated with North Shore University Hospital Manhasset, a highly rated hospital.

Dr. Sideridis is a Healthgrades Choice provider in Gastroenterology

The Healthgrades Choice designation helps you understand the most important factors to consider when choosing a healthcare professional. This designation is earned based on four set standards.
Read our methodology

  • Above average experience
  • Good hospital quality
  • Good patient ratings
  • No healthcare sanctions
  • Area of Expertise
    Dr. Sideridis specializes in the area of Gastroenterology. See board certifications
  • Explains Conditions Well
    Patients said this doctor explains conditions well. See reviews
  • Offers Telehealth
    This doctor offers telehealth appointments. Call the office to schedule an appointment.
  • Practices at Top Hospital
    Patient Safety Excellence Award™ See hospitals

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Dr. Sideridis' Reviews

Likelihood to recommend Dr. Sideridis

4.4
31 ratings, 15 with a written review
5 star
81%
81%
4 star
6%
6%
3 star
0%
0%
2 star
0%
0%
1 star
13%
13%

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Excellent care and bedside manner
I had both endoscopy and colonoscopy here and experience was amazing. Very efficient, everyone was kind. Dr. Sideridis has calming and excellent bedside manner. You are in great hands under his care.
What went well
  • Office environment
  • 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 others found this helpful
Helpful
David – Nov 16, 2022
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Made an appointment with the doctor, only to find out I was going to be seen by the p.a. The second appointment I was told would be with the doctor, only to find out it was with the p.a. Again. Not happy.
What went well
  • Office environment
  • Wait times
What could be improved
No results
Helpful
Sep 15, 2022
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Initial visit MD it’s a great talker saying he’s gonna take care of you. Totally different experience during procedures. Rushes and like a factory. Staff never followed up With further procedures I needed to have performed. Lied about putting in for authorization. Found out from my insurance company that they never did after waiting a few weeks. Horrible, upsetting experience. Kim in the office who does authorizations had me in tears on the phone. It’s been three days that I’ve been waiting for doctor to call me back and he has not to date. I called every day and asked for him to call me today how I was treated and regarding my constant abdominal pain.
What went well
No results
What could be improved
  • Didn't listen or answer questions
  • Staff wasn't friendly
  • Appointment was rushed
6 others found this helpful
Helpful
Mar 19, 2022
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Dr. Sideridis takes the time to listen to all of your concerns, He throughly diagnoses the situation and formulates the best course of action. He instills confidence, explains what will take place and reassures you that all will be taken care of. Unbelievable compassion and confidence. I would highly recommend him. Randee. H. 10/12/2020
What went well
  • Office environment
  • 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
Helpful
Oct 12, 2020
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I have white coat syndrome. His bedside manner is second to none. He was very thorough and made me very comfortable she listens to what you have to say and discusses all options
What went well
  • Appointment scheduling
  • Listened & answered questions
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
  • Didn't explain conditions well
4 others found this helpful
Helpful
Ellen Jarrell – Jul 24, 2019
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Great Dr, personable easy to talk to knows and does his job well. Definitely will recommend
What went well
No results
What could be improved
No results
5 others found this helpful
Helpful
Apr 16, 2019
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i would recommend dr sideridis but the actually office staff sucks they all have an attitude and they don’t do anything right
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
  • Staff wasn't friendly
3 others found this helpful
Helpful
Nov 17, 2018
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Absolutely amazing Drs. our daughter age 17 was referred to him after a visit to the ER that showed she had an ulcer. Dr Kadam & Dr. Sideridis saw our daughter and made her feel comfortable. They did the endoscopy the next day so there was no waiting and worrying about it! I highly recommend these Drs.
What went well
  • Office environment
  • 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
3 others found this helpful
Helpful
Donna Lanning in Hicksville , NY – Nov 10, 2018
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I had the displeasure of setting up a procedure with this doctor. My mistake he is an inconsiderate jerk and thinks his time was more valuable than mine.
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
  • Didn't trust the provider's decisions
  • Long wait times
2 others found this helpful
Helpful
El Jay Cee in NY – Jun 05, 2018
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With the right attitude and mindset, Doctor Sideridis exudes a passion for his field and has a keen understanding and empathy for his patients' history. He is very human and personable in his interactions and his authenticity is evident. He has helped alleviate many of my family's fears over procedures for my father and gave him the confidence he needed in a vulnerable time to move forward in the right direction towards the path to recovery. -Sultana Ahmed (Daughter) and Bayezid Ahmed (Father)
What went well
  • Office environment
  • 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
2 others found this helpful
Helpful
May 12, 2018
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Unprofessional. He was the attending specialist the day I had to go to the ER at Plainview Hospital. He walked into my room, shook my hand, and gave me his business card. Never saw him nor heard from him again. Next thing I know I get a $130 copay in the mail from his office. I called in to dispute it and his office staff was very rude and snippy. Not only was $130 over the standard $50 copay for specialists, I was forced to pay it because it was going to go to collections and hurt my credit.
What went well
No results
What could be improved
  • Office environment
  • 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
2 others found this helpful
Helpful
Plainview – Apr 25, 2018
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Definitely recommend him to friends,hes the best ever!Likelihood of recommending Dr. Sideridis to family and friends *yes,His the best ever!Kind,just like Drs.used to be,you put your fear in his hands and he takes over!
What went well
  • Office environment
  • 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
2 others found this helpful
Helpful
Jeannie Dionisio in Massapequa Park, NY – Apr 30, 2017
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Excellent gastroenterologist!! I had been to many different gastro doctors over the past 10 years and no one could figure out what is wrong with me. Thank God I found Dr. Sideridis!! He properly diagnosed me and has me on a treatment regimen that is working effectively. He is such a caring doctor as well always returns my phone calls in a timely manner and his staff is amazing!!!!
What went well
  • Office environment
  • 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
6 others found this helpful
Helpful
Nikki in West Babylon, NY – Apr 04, 2017
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Dr Sideridis is the easiest Dr. To understand. He explains everything so you understand. He takes his time and answers all your concerns. I've seen him 3 times for different situations. I truly recommend.
What went well
  • Office environment
  • 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
3 others found this helpful
Helpful
Queens Village, NY – Feb 08, 2017
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A kind, caring Doctor who takes the time to fully explain any health concerns.
What went well
  • Office environment
  • 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
4 others found this helpful
Helpful
Florence C. in Levittown, NY – Jul 29, 2016
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About Me

biography

Dr. Kostas Sideridis, DO is a gastroenterologist in Syosset, NY. Dr. Sideridis has extensive experience in Gastrointestinal Disorders, Esophageal Disorders, and Pancreatic Disease. He is affiliated with medical facilities such as Long Island Jewish...read more
  • Gastroenterology

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

  • Long Island Jewish Medical Center

    Fellowship Hospital
  • Winthrop - University Hospital

    Residency Hospital
  • Wychoff Heights Medical Center

    Internship Hospital
American Board of Medical Specialties®
American Board of Internal Medicine®
Gastroenterology
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.
  • English

  • Greek

Dr. Sideridis is a Healthgrades Choice provider in Gastroenterology

    Read our methodology

    Locations

    Long Island Medical PC

    Long Island Medical PC237 Jericho Tpke Syosset, NY 11791
    1

    Affiliated Hospitals

    • North Shore University Hospital

      300 Community Dr
      Manhasset, NY 11030
      Recipient of 19
      hospital awards

      Patient Safety Excellence Award™ (2024, 2023)

      Top in the nation for providing excellence in patient safety by preventing infections, medical errors, and other preventable complications

      Outstanding Patient Experience Award™ (2022)

      Top in the nation for providing excellence in patient safety by preventing infections, medical errors, and other preventable complications

      View all awards

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

      83%
      Patients said they were given information about recovering at home

      1% lower than the national average

      73%
      Patients said that doctors always listened to them and explained things well

      3% lower than the national average

      View all patient feedback
    • Long Island Jewish Medical Center

      270 05 76 Ave
      New Hyde Park, NY 11040
      Recipient of 14
      hospital awards

      Patient Safety Excellence Award™ (2025, 2024)

      Top in the nation for providing excellence in patient safety by preventing infections, medical errors, and other preventable complications

      View all awards

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

      83%
      Patients said they were given information about recovering at home

      1% lower than the national average

      75%
      Patients said that doctors always listened to them and explained things well

      1% lower than the national average

      View all patient feedback
    • Plainview Hospital

      888 Old Country Rd
      Plainview, NY 11803
      Recipient of 6
      hospital awards

      Patient Safety Excellence Award™ (2025, 2024, 2023)

      Top in the nation for providing excellence in patient safety by preventing infections, medical errors, and other preventable complications

      View all awards

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

      84%
      Patients said they were given information about recovering at home
      72%
      Patients said that doctors always listened to them and explained things well

      4% lower than the national average

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