Final answer:
The claim that voluntary hospitals make up 90% of all U.S. health care facilities is false; about 80% of U.S. hospitals are not-for-profit, and voluntary hospitals are included within this category.
Step-by-step explanation:
The statement that voluntary hospitals represent 90 percent of all health care facilities in the United States is false. In reality, about 80% of hospitals in the U.S. are not-for-profit entities. Voluntary hospitals are a part of this category. Unlike private for-profit hospitals, they do not distribute profits to owners or shareholders but reinvest any surpluses into the hospital's operations, research, or community health initiatives. These not-for-profit hospitals are one component of the country's health system, which also includes governmental agencies like Health and Social Services, for-profit health organizations, and Medicare and Medicaid programs that provide insurance for the elderly and certain low-income or disabled individuals respectively.