Medical care in the United States continues to consume an increasing a
mount of the Gross Domestic Product. To control the rising costs of he
alth care many industries have turned to a controlled form of financin
g and delivery of health care often referred to as managed care. Many
types of managed care exist, including preferred provider organization
s (PPO), exclusive provider organization (EPO), and health maintenance
organizations (HMO). HMOs involve prepaid premiums, limited panels of
providers and assumption of financial risk on the part of the provide
rs. A variety of HMOs are currently operating in the United States. Ma
naged care involves taking risks by those who administer it. Some meth
ods of controlling patient and physician behaviour by taking risks are
capitation, risk pools and withholds. With capitation the physician i
s paid a 'per member per month' fee regardless of whether the patient
uses the service. Risk pools are concerned with who shares the risk; f
or example, the primary physician shares the financial risk with speci
alists. Withholds involve a fee-for-service with a portion withheld wh
ich may be returned to the provider if he/she is parsimonious. A conce
rn expressed about HMOs is the possibility of restricted services. Mor
eover, hospital expenses make up a large portion of the total health c
are dollar. In 1995 the average length of stay for a Medicare patient
was 6.1 days as opposed to 3.9 days for the non-Medicare patient. Inde
ed, HMOs were the leaders in the development of same-day surgery and o
ut-patient treatment. Increasingly, in the United States, public and s
ocial insurance plans are turning to managed care as a method expendit
ure. Some government as Medicare and Medicaid, also increasingly offer
managed health options. The trend, for now, in the United States incr
eases enrollment in managed care plans. Although this is occurring at
a rapid pace, managed care will probably not be the final solution to
provision of medical care in the United States.