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Preventive services: Health care to prevent illness (like the flu) or detect it at an early stage, when treatment is most likely to work best.Medically necessary services: Services or supplies that are needed to diagnose or treat your medical condition and that meet accepted standards of medical practice.What's covered? Part B covers 2 types of services Some services may only be covered in certain facilities or for patients with certain conditions. But, your plan must give you at least the same coverage as Original Medicare. If you're in a Medicare Advantage Plan or other Medicare plan, your plan may have different rules.
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