Photo of Siam  Oottamasathien, MD

Siam Oottamasathien, MD

  • Director of Pediatric Urology Basic Science Research


Accepting New Patients




Centers & Specialties

MassGeneral Hospital for Children

Clinical Interests
  • Hypospadias
  • Penile abnormalities (hidden penis, penile torsion, penile curvature, phimosis)
  • Hydronephrosis/UPJ obstruction/megaureter/posterior urethral valves
  • Vesicoureteral reflux/urinary tract infection
  • Daytime incontinence, bedwetting
  • Dysfunctional voiding
  • Complex hypospadias reconstruction
  • Pediatric endourology/urinary stone disease
  • Ureterocele/ecotopic ureter
  • Complex lower urinary tract reconstruction
  • Pediatric Urology
Medical Education
  • MD, University of Colorado School of Medicine
  • Residency, University of Colorado Health Center
  • Fellowship, Vanderbilt University Medical Center
Board Certifications
  • Urology
  • Pediatric Urology
  • Boston: Massachusetts General Hospital
  • Braintree: Blue Hills Medical Center
Insurances Accepted
  • Aetna Health Inc.
  • AllWays Health (NHP) - ACD
  • AllWays Health (NHP) - PBO
  • Beech Street
  • Blue Cross Blue Shield - Blue Care 65
  • Blue Cross Blue Shield - Indemnity
  • Blue Cross Blue Shield - Managed Care
  • Blue Cross Blue Shield - Partners Plus
  • BMC HealthNet Mass Health MCO/ACO
  • Cigna (PAL #'s)
  • Commonwealth Care Alliance
  • Fallon Community HealthCare
  • Great-West Healthcare (formally One Health Plan)
  • Harvard Pilgrim Health Plan - ACD
  • Harvard Pilgrim Health Plan - PBO
  • Health Care Value Management (HCVM)
  • Humana/Choice Care PPO
  • Maine Community Health Options (MCHO)
  • MassHealth
  • Medicare
  • Medicare - ACD
  • OSW - Maine
  • OSW - New Hampshire
  • OSW - Rhode Island
  • OSW - Vermont
  • Private Health Care Systems (PHCS)
  • TriCare
  • Tufts Health Plan
  • Unicare
  • United Healthcare (non-HMO) - ACD
  • United Healthcare (non-HMO) - PBO
  • Well Sense Pediatrics

Note: This provider may accept more insurance plans than shown; please call the practice to find out if your plan is accepted.

Patient Age Group
Pediatric and Adult
Provider Gender

Research & Publications

Research Summary

View my most recent research


View my most recent publications at PubMed

Select Publications:

News & Events

  • MGHfC highlights innovations in pediatric research at 11th Annual Research Day

    This past May marked the 11th anniversary of MGHfC Research Day, an annual event that recognizes the pioneering research of investigators throughout the hospital whose discoveries help to better understand childhood health and disease. The focus of this years’ event was on innovation and taking children’s health and medicine even farther into the future with cutting edge care and research.


Mass General Hospital for Children - Braintree
340 Wood Road
Suite 204
Braintree, MA 02184
Phone: 617-724-0327
Fax: 781-884-6999
Massachusetts General Hospital
55 Fruit Street
Warren 11
Boston, MA 02114
Phone: 617-724-0327

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