Sometimes Medicare will decide that a particular treatment or service is not covered and will deny a beneficiary's claim. Many of these decisions are highly subjective and involve determining, for example, what is "medically and reasonably necessary" or what constitutes "custodial care." If a beneficiary disagrees with a decision, there are reconsideration and appeals procedures within the Medicare program.
While the federal government makes the rules about Medicare, the day-to-day administration and operation of the Medicare program are handled by private insurance companies that have contracted with the government. In the case of Medicare Part A, these insurers are called "intermediaries," and in the case of Medicare Part B they are referred to as "carriers." In addition, the government contracts with committees of physicians -- quality improvement organizations (QIOs) -- to decide the appropriateness of care received by most Medicare beneficiaries who are inpatients in hospitals.
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