The US health care sector includes more than 780,000 hospitals, doctor offices, emergency care units, nursing homes, and social services providers with combined annual revenue of about $2 trillion. Major companies include Kaiser Permanente, HCA, Ascension Health, and Tenet Healthcare. The sector is highly fragmented: the top 50 organizations generate just 15 percent of revenue.
The sector includes about 6,500 general hospitals; 75,000 nursing homes and residential care facilities; 13,000 diagnostic labs; 30,000 outpatient clinics; 127,000 dentist offices; 220,000 doctor offices; and 150,000 family and social services providers. Worldwide, health care expenditures total about $5 trillion annually, according to Swiss Re. Total health spending (both public and private) as a portion of GDP ranges from about 7 percent in countries such as Estonia to 17 percent in the US, according to the Organization for Economic Co-Operation and Development.