About Joshua J. Zaritsky, MD, PhD

As a pediatric nephrologist, Joshua Zaritsky, MD, PhD, cares for children with kidney and urinary tract conditions. He specializes in treating rare renal diseases, such as x-linked hypophosphatemia (XLH), hypophosphatasia (HPP), focal segmental glomerulosclerosis (FSGS), cystinosis, cystinuria and Bardet-Biedl syndrome (BBS) at Phoenix Children's. Previously, Dr. Zaritsky developed the apheresis and lipid apheresis programs at Nemours Children's Hospital, Delaware and St. Christopher's Hospital for Children in Philadelphia.

Dr. Zaritsky loves children's energy, making pediatrics an obvious choice in medical school. The opportunity to make a difference in the world while working with a great team of doctors led Dr. Zaritsky to Phoenix Children's.

Dr. Zaritsky earned his medical and doctoral research degrees at Stanford University School of Medicine in Stanford, California. He completed a pediatric internship and residency at Denver Children's Hospital and a pediatric nephrology fellowship at the University of California, Los Angeles School of Medicine. He is certified in pediatrics and pediatric nephrology by the American Board of Pediatrics.

Dr. Zaritsky is a member of numerous professional organizations, including the American Society of Pediatric Nephrology, the International Pediatric Nephrology Association, and the Society for Pediatric Research. He is also a member and a fellow of the American Society of Nephrology and the National Kidney Association. In addition, he has been listed among "Top Doctors" by Delaware Today magazine in 2016-2017, South Jersey Magazine in 2018 and Philadelphia magazine in 2017-2020.

Dr. Zaritsky has also been active in teaching the next generation of providers at Drexel University College of Medicine in Philadelphia, Florida State University College of Medicine in Tallahassee, Thomas Jefferson University's Sidney Kimmel Medical College in Philadelphia and the David Geffen School of Medicine at the University of California, Los Angeles.

Understanding the importance of research to find new treatments and cures, Dr. Zaritsky has participated in clinical studies in iron metabolism and published in numerous professional journals.

The opportunity to help families motivates Dr. Zaritsky. As a parent himself, he understands how stressful it can be to have a sick child. He knows optimism and a smile go a long way in helping families deal with tough situations. He is focused on reassuring children and families that he is here for them and will do his best to help them.

When he is not working, Dr. Zaritsky enjoys spending time with his two daughters and traveling with his family. In addition, he is active outdoors, riding his bike to work, hiking and birdwatching. He also enjoys volunteering with the National Kidney Foundation.

Medical School / Education

Stanford University School of Medicine, Stanford, CA


(Pediatrics) Children's Hospital Colorado, Denver, CO


(Pediatrics) Children's Hospital Colorado, Denver, CO


(Pediatric Nephrology) David Geffen School of Medicine at UCLA, Los Angeles, CA

Pediatrics, Pediatric Nephrology

American Board of Pediatrics

Top Doctor Recipient, South Jersey Magazine, 2018

Top Doctor Recipient, Philadelphia Magazine, 2017-2020

Top Doctor Recipient, Delaware Today magazine, 2016-2017

Academic Affiliations

Drexel University College of Medicine, Philadelphia, PA

Florida State University College of Medicine, Tallahassee, FL

Thomas Jefferson University's Sidney Kimmel Medical College, Philadelphia, PA

David Geffen School of Medicine at the University of California, Los Angeles, CA

Professor, Clinical Series, Child Health, University of Arizona College of Medicine, Phoenix, AZ

Clinical Professor, Department of Pediatrics, Creighton University School of Medicine, Omaha, NE

Professional Affiliations

Society for Pediatric Research

American Society of Pediatric Nephrology

International Pediatric Nephrology Association

Member and Fellow, National Kidney Association

Member and Fellow, American Society of Nephrology

Genetic testing in children with nephrolithiasis and nephrocalcinosis. Gefen AM, Sethna CB, Cil O, Perwad F, Schoettler M, Michael M, Angelo JR, Safdar A, Amlie-Wolf L, Hunley TE, Ellison JS, Feig D, Zaritsky J. Pediatr Nephrol. 2023 Jan 23. doi: 10.1007/s00467-023-05879-0. Online ahead of print. PMID: 36688940

Continued reduction in peritonitis rates in pediatric dialysis centers: results of the Standardizing Care to Improve Outcomes in Pediatric End Stage Renal Disease (SCOPE) Collaborative. Neu AM, Richardson T, De Souza HG, Mahon AR, Keswani M, Zaritsky J, Munshi R, Swartz S, Sethna CB, Somers MJG, Warady BA; SCOPE Collaborative Participants. Pediatr Nephrol. 2021 Aug; 36(8):2383-2391. doi: 10.1007/s00467-021-04924-0. Epub 2021 Mar 1. PMID: 33649895

Novel genetic testing model: A collaboration between genetic counselors and nephrology. Amlie-Wolf L, Baker L, Hiddemen O, Thomas M, Burke C, Gluck C, Zaritsky JJ, Gripp KW. Am J Med Genet A. 2021 Apr; 185(4):1142-1150. doi: 10.1002/ajmg.a.62088. Epub 2021 Jan 21. PMID: 33475249

LDL-apheresis-induced remission of focal segmental glomerulosclerosis recurrence in pediatric renal transplant recipients. Shah L, Hooper DK, Okamura D, Wallace D, Moodalbail D, Gluck C, Koziell A, Zaritsky JJ. Pediatr Nephrol. 2019 Nov; 34(11):2343-2350. doi: 10.1007/s00467-019-04296-6. Epub 2019 Jun 27. PMID: 31250206

Dyslipidaemia in nephrotic syndrome: mechanisms and treatment.Agrawal S, Zaritsky JJ, Fornoni A, Smoyer WE. Nat Rev Nephrol. 2017 Dec 13; 14(1):70. doi: 10.1038/nrneph.2017.175. PMID: 29234164


Phoenix Children's Hospital - Thomas Campus

1919 E. Thomas Rd.
Phoenix, AZ 85016

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