Siam Oottamasathien, MD

Practice locations

Addresses where Siam Oottamasathien is enrolled with Medicare (CMS data updated October 2, 2026).

• 300 Longwood AveBoston, MA 02115 (617) 355‑6000

Group practices

Medicare enrollment lists Siam Oottamasathien as a member of this group (CMS data updated October 2, 2026).

• Children's Urological Foundation17 clinicians in the group

Specialties

• Urologyprimary

Find other Urology doctors in Massachusetts →

Other urologists in Boston

Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.

• Boris Gershman, MD
• Evalynn Vasquez, MD
• Filipe L. De Carvalho, MD
• James Wren, MD
• Ricardo Munarriz, MD
• Matthew Mossanen, MD
• Bartley G. Cilento Jr., MD
• Avinash Maganty, MD

All urologists in Boston →

Other clinicians in Children's Urological Foundation

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Evalynn Vasquez, MD
• Kenneth Softness, MD
• Hsin-Hsiao S. Wang, MD
• Richard S. Lee, MD
• Ted Lee, MD
• Erin R. McNamara, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
3. Medicare Care Compare — official Medicare tool to look up clinicians