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Gregory Mark Ackert

Gregory Mark Ackert, MD

Gastroenterology

Catholic Health Physician Partners
Accepting New Patients
Need help scheduling? Call 516-775-4545

Highlights

Languages

  • English

Gender

Male

About Gregory Mark Ackert

Gregory Ackert, MD, completed his Internal Medicine residency at Long Island Jewish Medical Center in 1981 and his Gastroenterology Fellowship there in 1983. He served as Chief Resident in 1984. Dr. Ackert is dedicated to comprehensive digestive health care and is an active member of several leading medical associations.

Locations

  1. Gastroenterology, Ambulatory Care at Lake Success
  2. Endoscopy, Ambulatory Care at Lake Success

Expertise

Education

  • Medical School: NYU School of Medicine, 1978

Board Certifications

  • Gastroenterology: American Board of Internal Medicine, 1985
  • Internal Medicine: American Board of Internal Medicine, 1981

Insurance

Search plans
  • Affinity
  • Affinity Essential
  • Affinity Exchange
  • Affinity Medicaid
  • Affinity Medicare
  • Molina
  • Molina Exchange
  • Molina Medicaid

Ratings & Reviews

4.9 out of 5

178 ratings, 30 reviews

The Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.

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    5 out of 5 stars
    Reviewed on 5/21/2026

    Dr. Ackert is a caring and dedicated physician

    5 out of 5 stars
    Reviewed on 5/21/2026

    I have gone to Dr. Ackert for many years - He has provided excellent care and looks at the whole person. He is calm, thorough and relates to me as a person and not "a case."

    5 out of 5 stars
    Reviewed on 5/20/2026

    Perfect

    5 out of 5 stars
    Reviewed on 5/19/2026

    Dr. Ackert is an outstanding doctor. He is very compassionate and always listens to my concerns. He has been taking care of me for over 25 years and I trust him completely.

    5 out of 5 stars
    Reviewed on 5/9/2026

    Listened very well and took time to explain both issues and plan going forward (both Doctor and PA).

    5 out of 5 stars
    Reviewed on 5/1/2026

    Dr. Ackert is caring, considerate and patient. He was wonderful and I felt very confident that I was in good hands.

    5 out of 5 stars
    Reviewed on 4/30/2026

    Dr Gregory Ackert was excellent and gave me best advice and listened to my concerns. Very caring.

    5 out of 5 stars
    Reviewed on 4/28/2026

    My wife and other family members have switched to this practice because of the care I receive.

    5 out of 5 stars
    Reviewed on 4/23/2026

    Dr. Ackert was very thorough and answered all my questions.

    5 out of 5 stars
    Reviewed on 4/9/2026

    Again, very happy and Dr. Ackert was very thorough

    5 out of 5 stars
    Reviewed on 3/30/2026

    Dr.Ackert and PA always listens to my needs!

    5 out of 5 stars
    Reviewed on 3/12/2026

    Always the best

    5 out of 5 stars
    Reviewed on 2/17/2026

    We have the most respect and faith in Dr. Ackert.

    5 out of 5 stars
    Reviewed on 2/2/2026

    Dr. Ackert is OUTSTANDING!

    5 out of 5 stars
    Reviewed on 1/29/2026

    Dr. Ackert is an excellent care provider.

    5 out of 5 stars
    Reviewed on 1/23/2026

    Good

    5 out of 5 stars
    Reviewed on 1/18/2026

    Love Dr. Ackert. Gave me time to ask and answer all my questions.

    5 out of 5 stars
    Reviewed on 1/15/2026

    Excellent bedside manner , very professional and down to earth! Not condescending like some providers are !

    5 out of 5 stars
    Reviewed on 1/15/2026

    I feel that Dr. Ackert listen to my complaints carefully and followed up with specific questions. I feel confident he will help me with my problem.

    5 out of 5 stars
    Reviewed on 1/8/2026

    Dr. Ackert has been providing care for my parents and I for decades and is an example for your younger doctors to emulate. His caring, diligence and thoroughness is unmatched by other providers I have met at CHS.

    5 out of 5 stars
    Reviewed on 12/31/2025

    Dr. Ackert is the best. True compassion in all aspects of care.

    5 out of 5 stars
    Reviewed on 12/31/2025

    Dr. Ackert is an outstanding provider. He is extremely knowledgeable.

    5 out of 5 stars
    Reviewed on 12/30/2025

    Dr. Ackert is a consummate professional and gentleman in how he practices. A 10 out of 10, we need more of him!!

    5 out of 5 stars
    Reviewed on 12/25/2025

    Ive been a patient of Dr. Ackert for decades and plan to for more decades to come. He is soft spoken, respectful and knows everything. A superb doctor.

    5 out of 5 stars
    Reviewed on 12/23/2025

    He's an amazing Dr. He takes his time to talk to his patients and explains things!

    5 out of 5 stars
    Reviewed on 12/22/2025

    Dr. Ackert went over my symptoms and the medication he would prescribe. He advised me on possible side effects, the importance of my diet and exercise.

    5 out of 5 stars
    Reviewed on 12/18/2025

    Dr. Ackert has been my PCP for over 16 years. I am always more than satisfied with the treatment I receive from him and his staff. Dr. Gregory Ackert is the BEST!!!

    5 out of 5 stars
    Reviewed on 12/17/2025

    Dr. Ackert is extraordinarily doctor. He carefully listens to his patients. He gives all the necessary directions. He is the Best by far. I highly recommend him to my family and friends

    5 out of 5 stars
    Reviewed on 11/30/2025

    Dr Ackert is the best! I love him!!! My entire family does!

    5 out of 5 stars
    Reviewed on 11/28/2025

    I have been under Dr Ackert's care for years. He is a talented and experienced professional. You should be happy to have him as part of CHsLI. His staff is amazing. Be glad that you have them as well