<unk>  is a form of group<unk> , where individuals pay premiums or taxes in order to help protect themselves from<unk> gh or unexpected healthcare expenses.<unk>  works by estimating the overall "risk" of healthcare expenses and developing a routine finance structure (such as a monthly premium, or annual tax) that will ensure that money is available to pay for the healthcare benefits specified in the<unk>  agreement.  The healthcare benefit is administered by a central organization, which is most often either a government agency, or a private or not-for-profit entity operating a health plan. 
Market-based health care systems such as  that in the United States rely heavily on private and not-for-profit<unk> .
Health insurance
Mobile health
Medical guideline
Special education
Health care
Artificial life
Health care in Mexico
Essential medicines