Medicine is practiced within the medical system, which is a legal, credentialing and financing framework, established by a particular culture or government. The characteristics of a health care system have significant effect on the way medical care is delivered.
Most industrialized countries and many developing countries deliver health care though a system of universal health care which guarantees care for all through a system of compulsory private or co-operative health insurance funds or via government-backed social insurance. This insurance (in effect, a form of taxation) ensures that the entire population has access to medical care on the basis of need rather than ability to pay. The delivery systems may be provided by private medical practices or by state-owned hospitals and clinics, or by charities.
Most tribal societies but also some communist countries (e.g. China) and at least one industrialized capitalist country (the United States) provide no guarantee of health care for the population as a whole. In such societies, health care is available to those that can afford to pay for it or have self insured it (either directly or as part of an employment contract) or who may be covered by care financed by the government or tribe directly.
Transparency of information is another factor defining a delivery system. Access to information on conditions, treatments, quality and pricing greatly affects the choice by patients / consumers and therefore the incentives of medical professionals. While the US health care system has come under fire for lack of openness, new legislation may encourage greater openness. There is a perceived tension between the need for transparency on the one hand and such issues as patient confidentiality and the possible exploitation of information for commercial gain on the other.
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