To select the 100 top hospitals , or benchmark institutions , hospitals with at least 25 beds were scored against others within the same category : Major teaching hospitals ( 400 or more beds and high levels of physician education and research ) ; teaching hospitals ( 200 or more beds and some physician education ) and three tiers of community hospitals : large ( 250 or more beds ) , medium-size ( 100-249 beds ) and small ( 25-99 beds ) .