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Dr. Mark Lowenheim, MD

Dr. Mark Lowenheim, MD

Pediatric Gastroenterology*
35+ years of experience

Dr. Mark Lowenheim, MD is a pediatric gastroenterologist in Port Jefferson, NY and has over 35 years of experience in the medical field. He graduated from Ross University School of Medicine in 1985. He is affiliated with medical facilities such as Mather Hospital and Peconic Bay Medical Center. He is accepting new patients and telehealth appointments.

3.6 Star Rating
Based on 17 reviews 3.6 Star Rating (17 reviews)

Practice

200 Belle Terre Rd Ste 400 Port Jefferson, NY 11777
Telehealth available

At a Glance

  • Offers Telehealth
    This doctor offers telehealth appointments. Call the office to schedule an appointment.
  • 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
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Dr. Lowenheim's Reviews

Likelihood to recommend Dr. Lowenheim

3.6
17 ratings, 3 with a written review
5 star
65%
65%
4 star
0%
0%
3 star
0%
0%
2 star
6%
6%
1 star
29%
29%

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misdiagnosed
I brought my 3 month old to Dr Lowenheim for poor weight gain. he basically said it was normal and blamed it on the inflated weight at birth due to my gestational diabetes. He didn’t change his diet nothing he prescribed a medication that made my babies reflux worse. fastest initial visit ever!!!!!. I went to another doctor for a second opinion and he diagnosed my baby as failure to thrive (he was the 2nd percentile)and gave me a plan and diet change. fast forward to my baby in the 75th percentile and has since gained 8lbs. trust your gut and goto a doctor that gives you the time of day not excuses
What went well
  • Wait times
What could be improved
  • Didn't explain conditions well
  • Appointment was rushed
  • Didn't trust the provider's decisions
1 other person found this helpful
Helpful
Apr 04, 2022
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My daughter has been seeing him for 4 years!! Since she was 2 years old she has had issues!! He always gets us in and is great with her!! We love him and would definitely recommend him to friends!!
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
Kim Van Helmond – Apr 16, 2020
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Dr. Lowenheim is very arrogant. He misdiagnosed my child, and after repeated phone calls and questions, he continued to be rude, curt, and only kept suggesting a repeat endoscopy and colonoscopy, even though my child’s other doctors advised strongly against it. He acts as if he is always in a rush and your questions are bothersome to him. Finally left his practice, followed up with a different Ped GI, and in onlyone visit got all the answers we needed and, more importantly, a correct diagnosis.
What went well
  • Wait times
What could be improved
  • Office environment
  • 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
Dec 16, 2018
×Post a ResponseAre you Dr. Lowenheim?

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About Me

biography

Dr. Mark Lowenheim, MD is a pediatric gastroenterologist in Port Jefferson, NY and has over 35 years of experience in the medical field. He graduated from Ross University School of Medicine in 1985. He is affiliated with medical facilities such...read more
  • Pediatric 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.

  • Ross University School Of Medicine

    Medical School, 1985
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.

Locations

Practice

Office200 Belle Terre Rd Ste 400 Port Jefferson, NY 11777
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 in the nation for overall patient experience based on nine measures related to doctor and nurse communication, hospital cleanliness and noise levels, and medication and post-discharge care instructions

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

    Top in the nation for overall patient experience based on nine measures related to doctor and nurse communication, hospital cleanliness and noise levels, and medication and post-discharge care instructions

    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
  • Peconic Bay Medical Center

    1 Heroes Way
    Riverhead, NY 11901
    Recipient of 11
    hospital 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

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

    1% lower than the national average

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