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By Fred Schulte, Center for Public Integrity medicarecard

Government audits just released as the result of a lawsuit detail widespread billing errors in private Medicare Advantage health plans going back years, including overpayments of thousands of dollars a year for some patients.

Since 2004, privately run Medicare Advantage plans, an increasingly popular alternative to traditional Medicare, have been paid using a risk score calculated for each patient who joins. Medicare expects to pay higher rates for sicker people and less for those in good health.