I would have to say emergency medical services... a great percentage in rural America are 100% voluntary ambulance agencies.
ABA
Nursing
I think the department of health and human services.
In the US, a written Health and Safety Policy statement is not required by any law or regulation. However, it is always advisable to have such a statement, as part of a good Health and Safety Program, regardless of the size of the organization or the nature of its activities. One of the criteria for being certified to ISO 14001 or one of the other Environmental Health and Safety management standards is to have such a statement, but as these standards are voluntary, no organization is required to meet them.
aarp and national rifle organization
In the US and Canada It would be UFC.
25,000,000
national safety council
The largest healthcare provider in the US is the Veteran's Administration, which maintains 1,384 hospitals and clinics.
Health care system
There is no organization called the "the department of occupational safely and health administration" In the US, the Occupational Safety and Health Administration is part of the US Department of Labor.
The ICD9-CM is based on the official version of the Work Health Organization's of ICD9. The U.S Department of Health and Human services maintains the official version for the US.