In order to be an approved training program, a program must provide training in community psychiatry. Community psych is public psychiatry (i.e. in a gov't supported entity, not a private hospital). Community psych is required because chronically ill patients tend not to have insurance. In addition community psych settings tend to make use of case managers.
This is the definition from the ACGME (
http://www.acgme.org/acWebsite/RRC_400/400_prIndex.asp)
"Community Psychiatry: This experience must expose residents to persistently and
chronically-ill patients in the public sector, (e.g., community mental health centers, public hospitals and agencies, and other communitybased
settings). The program should provide residents the opportunity to consult with, learn
about, and use community resources and services in planning patient care, as well as to consult and work collaboratively with case managers, crisis teams, and other mental
health professionals."