Dr. Rei Tosu, Pediatrics

Dr. Tosu is a pediatrician and is a member of the CHOC Primary Care Network who treats kids and teens in Los Alamitos.


Los Alamitos Pediatric Medical Group, Inc.
10861 Cherry Street, Suite #305
Los Alamitos, CA 90720
phone: 562-598-4848
fax: 562-598-5949


  • Medical School
    Tufts University School of Medicine, MA
  • Internship
    University of California, Irvine and Long Beach Memorial Miller Children’s Hospital
  • Residency
    University of California, Irvine and Long Beach Memorial Miller Children’s Hospital

  • Rei Tosu M.D.
    • Office: 562-598-4848
    • Specialty: Pediatrics
    • Board Certified: Pediatrics


Los Alamitos Pediatrics - A member of the CHOC Network

10861 Cherry Street
Suite 305
Los Alamitos, CA 90720


Dr. Rei Tosu has been in practice at Los Alamitos Pediatric medical group since 2004.  She is Board Certified in Pediatrics and is a fellow of American Academy of Pediatrics. 

She split her childhood years living in the U.S. and Japan and grew up bilingual in English and Japanese.  She attended Brown University in Providence, R.I. for her undergraduate studies where she received a Sc.B. in Neuroscience.  After spending a year doing research, she went on to attend Tufts University in Boston, MA and received her M.D.  In search of better weather, she moved to Orange County, CA to do her pediatric residency at the University of California, Irvine, and Long Beach Memorial Miller Children’s Hospital. After two years of working as a chief resident and seeing patients at UCI, she joined Los Alamitos Pediatrics in 2004.

She met her husband, currently a nephrologist in the area, while in medical school and got married during residency. She lives with her husband and their three children in Fountain Valley. She enjoys being involved with the children’s schools and activities and traveling with her family.  She loves getting to know the families in the practice and watching the children grow. She feels privileged to take part in their lives and strives to provide the best care possible.