Of the 1,100 hospitals involved in graduate medical education in this country, the 400 COTH member institutions train about three-quarters of the residents in the United States.

Its School of Nursing was established in 1893, and the first graduate medical education (GME) program was a one-year general internship approved in 1926.

A full-time faculty was formed and eventually evolved into the multi-specialty, not-for-profit practice called Danbury Office of Physician Services, PC.

[11] A three-story addition (Stroock Tower) and a two level parking garage opened in January 1985.

[12] On June 20, 2014, a new 11 story, 316,000 sf addition to the hospital (The Peter and Carmen Lucia Buck Pavilion) was opened.