Establishments primarily engaged in providing hospital, medical, and other health services to subscribers or members in accordance with prearranged agreements or service plans. Generally, these service plans provide benefits to subscribers or members in return for specified subscription charges. The plans may be through a contract under which a participating hospital or physician agrees to render the covered services without charging any additional fees. Other plans provide for partial indemnity and service benefits. Also included in this industry are separate establishments of health maintenance organizations which provide medical insurance. Establishments providing these services through their own facilities or employed physicians are classified in Major Group 80.