Lionel U.
Mailloux, MD

Nephrology, Internal Medicine, Geriatric Medicine

(516) 465-8200

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About your doctor:

Member of Northwell Health Physician Partners
Languages spoken:


Board certifications:

  • Internal Medicine - American Board of Internal Medicine
  • Nephrology - American Board of IM/Nephrology

Academic titles

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

Medical school

  • Hahnemann University Humanties & Sciences


  • Hartford Hospital


  • Harrisburg State Hospital


  • Nephrology-Drexel University College of Medicine


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Locations & insurance

  • 100 Community Drive
    Suite 2nd floor
    Great Neck, NY 11021

    Fax: (516) 465-8202

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Patient ratings & comments

Northwell Health Physician Partners is improving the patient experience by displaying physician ratings and reviews. Learn more.

Friendliness/courtesy of the care provider


Explanations the care provider gave you about your problem or condition


Concern the care provider showed for your questions or worries


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


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


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


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


Amount of time the care provider spent with you


Your confidence in this care provider


Likelihood of your recommending this care provider to others


Most recent comments:

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

"Very good is not enough. Care here is excellent!"

"Excellent physician!"

"Dr. Mailloux is an exceptional physician."

"The best."

"Dr. Mailloux is wonderful and thorough doctor. A real gentleman with a calming demeanor."

"Dr. M. is great."

"No finer doctor in the world!"

"Grateful and pleased."

"Again, Dr. Mailloux is the best!!!"

"A rare doctor who really cares for his patients."

"Excellent doctor!"

"Dr. Mailloux is the best! Period!"

"Dr. Mailloux is wonderful!"

"More than any other doctor!"

"The best doctor I did ever know, Dr. Lionel U. Mailloux -"

"Dr. Maillock is an excellent physician. Knowledge, caring, thorough."

"Always the best."

"Love Dr. Mailoux - he's the best!"

"I have always experienced an excellent relationship with Dr. Mailloux."

"could not be better have recommended him to several other people"

"Excellent service."

"Very good."

"The best doctor!!"

"Dr. Mailloux is one of favorite doctors, very caring!!"

"Dr. Mailloux is the finest physician I have ever used. He is outstanding. Every resident should spend time with Dr. Mailloux to learn how to be an outstanding physician. Definitely a doctor to emulate."

"Always the best care."

"Dr. Mailloux is a special man & an excellent doctor."

"Doctor is one of the most caring and knowlegaable of any I have ever seen. His concerns have no bounds"

"Always concerned about the patients well-being."

"Dr. Mailloux is the best! Period."

"My doctor is one of the best technically and personally"

"He is outstanding in his field. I've been his patient for close to 20 years."

"Only good experience!"

"I love Dr. Maillous he is best Dr. so kind, smart, and always willing to try to figure out a plan. Calls back & follows through. #7. Always so calm in, not in hurry."

"Outside medical sources confirm that Dr. Mailloux is the best in the field of nephrology."

"dr mailloux is so good!"

"Dr. Mailloux has been my nephrologist for 20+ years. He is a superb physician."

"he is the best"

"Already have recommended him over the last 10 years."

"Dr. Mailloux is fantastic."

"My provider for over 15 years. Excellent!"

"Very good experience."

"very personable contact;dealing with a touchy condition (kidneys)I put my trust in this doctor hoping for the best"

"This dr. saved my life."

"Dr. Mailloux -> excellent. #1-10. MD. #9. EXCELLENT."

"All excellent"

"Provider who will be hard to replace when he retires."

"Lional Mailloux is an excellent doctor, competent & caring!"

"I have always had a good experience."

"Excellent dr. easy to talk to. Answers all my question."

"Dr. Mailloux has been pro-active as well for "on target", seeing things "outside the box" - AWESOME in KNOWLEDGE for my complicated medical history."

"Dr. Mailloux cares about his patients he is a role model for other physicians to follow."

"Dr. Mailloux is top notch, very good experience."

"I have complete confidence in Dr. Mailloux's decisions and like him personally."

"Dr. Mailbox is a wonderful dr., very under STANDING when I have complete confidence in."

"Dr. Mailloux is the consummate professional."

"Dr. Mailloux is an excellent physician."

"Excellent experience."

"Fabulous doctor! He did not "dumb down" explanations, as so often happens."

"He is one of the finest doctors a person could have."

"Dr. engenders great calm & competence."

"Dr. Mailloux is an excellent physician."

"Great doctor!"

"I have been seeing Dr. Mailloux many years. Always kept me up to date as I had kidney transplant."

"Excellent experience."

"Dr. Mailloux is an excellent doctor."

"Have recommended family member."