Individual provider · Type 1 NPI

William Charles O'Callahan Jr., MD

Emergency Medicine Physician · Holden, MA

NPI number 1114964186 Active

Practice location

5 Shrewsbury St Ste D
Holden, MA 01520-1960

Call (508) 829-3800 Map

Fax (508) 829-3802

Other practice locations

  • 688 Bliss Rd, Longmeadow, MA 01106-1534 · (413) 567-0011
  • 2040 Boston Rd Ste 5, Wilbraham, MA 01095-1380 · (413) 599-3800

Specialties and licenses

TaxonomyCodeLicense
Emergency Medicine Physician Primary 207P00000X79001 (MA)

Emergency Medicine Physician: An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in respo…

10 other providers at this address

Other emergency medicine physician providers in Holden

See all in Holden →

About NPI 1114964186

William Charles O'Callahan Jr., MD's National Provider Identifier is 1114964186, issued on May 31, 2006. The primary taxonomy on file is Emergency Medicine Physician (207P00000X), and the practice location is in Holden, MA. The record was last updated on Oct 4, 2026.