Credentials

Credentials

  • Board certifications

    • Internal Medicine - American Board of Internal Medicine

    • Nephrology - American Board of IM/Nephrology

  • Academic titles

    • Associate Professor, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell

  • Medical school

    • University of Colorado at Denver

  • Affiliations

    • Lenox Hill Hospital

Locations & insurance

Locations & insurance

Insurance information

Don't be surprised

Learn how you can avoid unanticipated medical bills

Learn more about medical bills

Patient ratings & comments

Patient ratings & comments

Unlike websites where anyone can post doctor reviews, only actual patients can provide information by completing the survey sent to them by Press Ganey. Learn more.

4.9 out of 5 4.9 out of 5 rating
| 125.0 patient ratings & 47 patient comments

Friendliness/courtesy of the care provider

4.9 out of 5 4.9 out of 5 rating

Explanations the care provider gave you about your problem or condition

4.9 out of 5 4.9 out of 5 rating

Concern the care provider showed for your questions or worries

4.9 out of 5 4.9 out of 5 rating

Care provider's efforts to include you in decisions about your treatment

4.9 out of 5 4.9 out of 5 rating

Information the care provider gave you about medications(if any)

4.8 out of 5 4.8 out of 5 rating

Instructions the care provider gave you about follow up care (if any)

4.9 out of 5 4.9 out of 5 rating

Degrees to which care provider talked with you using words you could understand

4.9 out of 5 4.9 out of 5 rating

Amount of time the care provider spent with you

4.8 out of 5 4.8 out of 5 rating

Your confidence in this care provider

4.9 out of 5 4.9 out of 5 rating

Likelihood of your recommending this care provider to others

4.9 out of 5 4.9 out of 5 rating

Most recent comments

Patient comments are gathered from the Press Ganey Pateint Satisfaction Survey. Comments are displayed in their entirety and are anonymous for patient privacy.

09/26/2018
"Exceptional caregiver, listens and provides information, researches drug interactions. Totally confident in this physician."
09/10/2018
"Confidence in him is so good I recently asked him to become my primary physician since my PP had just retired."
08/28/2018
"We leave feeling well informed and knowing that Dr. Gardenswartz is a phone call away."
08/24/2018
"Dr. excellent."
07/16/2018
"I have already recommended Dr. Gardenswartz."
06/29/2018
"Tip top practitioner of medicine, etc."
06/28/2018
"Best doctor ever. Waiting time worth it BECAUSE each patient is treated with respect, compassion, care, and the best medical treatment. "
06/23/2018
"Dr. Gardenswartz is the best."
06/16/2018
"he is THE BEST"
06/11/2018
"Dr. Gardenswartz is professional Dr. in every sense of the word. He is one of a kind. I trust his medical knowledge and professional advice 100%. He is attentive to my concerns, responds to all my medical questions, remembers everything and is very thorough in investigating the root of each and every problem. Dr. Gardenswartz follows through on every recommendation and refers me to other mediacl professionals should the need occur. I am blessed to have him as my Dr."
05/31/2018
"Dr. Mark Gardenswartz is the best. "
05/29/2018
"9. Excellent doctor."
05/25/2018
"Dr. Gardenswartz has been my nephrologist for the last 20 years! He is without a doubt the MOST caring, & professional dr. that anyone can hope for!"
04/15/2018
"LISTENED TO ME, TOOK NOTE OF MY RELATIVELY NEW COMPLAINT/PROBLEM AND REFERRED ME TO DR. HARARY, A GASTROENTEROLOGIST. HE CALLED AND SPOKE TO HIS COLLEAGUE RIGHT IN THE EXAM ROOM AND MADE THE APPOINTMENT ON MY BEHALF. EXCELLENT. I SAW DR. HARARY THE FOLLOWING DAY 5 APRIL."
03/27/2018
"Excellent doctor."
03/27/2018
"The BEST DOCTOR I ever met!"
02/23/2018
"Dr. Gardenswartz is GREAT healthcare provider. There aren't enough adjectives to describe him. He is very smart, kind, efficient, and knowledgeable about all areas of MEDICINE."
01/27/2018
"Dr. Gardenswartz has been my physician for 30 years. His attention is focused, he is thorough and very caring. I know I am in excellent hands with Dr. Gardenswartz."
01/09/2018
"Dr. Gardenswartz is a trustworthy and highly still physician who we trust respect and have great competence in his medical ability."
12/21/2017
"Excellent - all around."
10/20/2017
"Dr. Gardenswartz is an extraordinary doctor."
10/16/2017
"Excellent care!"
09/21/2017
"Always cheerful and caring."
09/18/2017
"My confidence in him is indisputable and I willingly accept his advice for referrals."
08/31/2017
"Excellent."
05/16/2017
"My last visit the doctor had to send me to Lenox Hill E.R. The doctor called ahead and spoke to the E.R. doctor about my condition and suggested some tests to be performed."
04/05/2017
"Dr. Gardenswartz is not only a medical practitioner of great expertise; he is a _____, compassionate person who treats you with personal concern."
01/03/2017
"An amazing physician/diagnostician."
12/06/2016
"Dr. G is a warm, caring, brilliant physician. You should have more like him."
10/14/2016
"I have been using Dr. Gardenswartz for app 19 years - He is a MOST pleasant, caring, & wonderful nephrologist! I feel he's like a "guardian angel"!"
06/03/2016
"Good experience - I travel from NJ to see this doctor."
06/01/2016
"He is the best."
05/30/2016
"Wonderful doctor."
05/26/2016
"Dr. Gardenswartz is a VERY knowledgeable skilled SMART MD & is ALWAYS ON TARGET with me in terms of diagnosis & care."
02/23/2016
"Dr. G is an outstanding physician who, in addition, related to his patients with compassion."
01/27/2016
"Great doctor & his nurse."
12/29/2015
"Dr. Gardenswartz is the best doctor I've every gone to."
09/09/2015
"Dr. Gardenswartz treats his patients not just as patients, but as PEOPLE."
08/24/2015
"Always attentive and caring."
04/01/2015
"Good."
10/23/2014
"Dr. Gardenswartz is exceptional!"
10/03/2014
"Dr. G. is an amazing, respectful, caring, knowledgeable doctor."
09/11/2014
"Doctor has provided great referrals (orthopedic, neurological & heart)."
08/13/2014
"Dr. Gardenswartz defines excellence."
07/29/2014
"Always has good humor -"
07/15/2014
"Clinically and professionally Dr. Gardenswartz has it all - personal, professional, commitment and ability to deliver excellent care."
07/11/2014
"I consider myself very lucky to have Dr. Gardenswartz as my doctor!"