Jillian K. Warejko, MD


Pediatric Nephrology, Pediatrics

Conditions & Treatments

Kidney Transplant, Transplantation

(877) 925-3637
Accepting New Patients
Telehealth Visits


Jillian Warejko, a pediatric nephrologist, was drawn to treating children with kidney diseases because of the long-lasting relationships she forms with her patients, and the many successful treatment options she can offer them. 

“The kidneys are one of the few organ systems where if, in the worst case scenario, I need to step in and intervene because they aren’t doing what they need to do, I can because there’s dialysis and transplant,” Dr. Warejko says. “You can replace a nonfunctioning kidney with a functioning one. You can restore previously lost function. All of this allows kids to grow and develop as they should. They can get dialysis or a transplant and still go to school. And in some cases, I see kids who are born with a kidney problem in the hospital and continue treating them until they’re off to getting their Ph.D., which is really cool.”

The kidneys also continue to fascinate Dr. Warejko. “As human beings, we’re 70 percent water and kidneys dictate how the salt and water in your body stays in balance. Your heart needs certain electrolytes to be in certain proportions to beat well. Your brain needs the same to think and transmit signals so you can move your muscles and think,” she says. “In most cases, you can’t feel your kidneys and they don’t cause you pain, but they can certainly causes a lot of health issues if they aren’t perfectly tuned.”

Dr. Warejko’s research explores nephrotic syndrome, a rare form of kidney disease that causes the kidneys to become “very leaky,” she says, and put protein in the urine, which causes the organs to swell and not function well. 





Affiliated With

Yale Medicine, Yale New Haven Children’s Hospital


Yale New Haven Children's Hospital

1 Park St
New Haven, CT 06504

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(203) 785-3462

Pediatric Specialty Center

5520 Park Avenue
Trumbull, CT 06611

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Monday9:00 AM - 5:00 PM
Tuesday9:00 AM - 5:00 PM
Wednesday9:00 AM - 5:00 PM
Thursday9:00 AM - 5:00 PM
Friday9:00 AM - 5:00 PM

Pediatric Specialty Center

One Long Wharf Drive
New Haven, CT 06511

Get Directions

Monday9:00 AM - 5:00 PM
Tuesday9:00 AM - 5:00 PM
Wednesday9:00 AM - 5:00 PM
Thursday9:00 AM - 5:00 PM
Friday9:00 AM - 5:00 PM

Education & Training


University of Rochester NY;Case Western Reserve University University of Rochester School of Medicine


St. Louis Children's Hospital


Boston Children's Hospital

Accepted Insurance

Insurance coverage regularly changes, please contact the doctor’s office directly to verify that your specific insurance plan is accepted.

  • aetna
  • anthem bc/bs
  • berkeley care network
  • cigna healthcare
  • community care network
  • connecticare
  • corvel
  • first health network
  • focus healthcare
  • great west
  • husky
  • medicaid
  • medicare
  • multiplan
  • oxford health plans
  • railroad medicare
  • tricare/champus
  • united healthcare
  • us family health plan
  • wellcare