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By Joe Eaton and David Donald, The Center for Public Integrity 

Second in a series

Judging by their bills, it would appear that elderly patients treated in the emergency room at Baylor Medical Center in Irving, Texas, are among the sickest in the country — far sicker than patients at most other hospitals.

In 2008, the hospital billed Medicare for the two most expensive levels of care for eight of every 10 patients it treated and released from its emergency room — almost twice the national average, according to a Center for Public Integrity analysis. Among those claims, 64 percent of the total were for the most expensive level of care.

But the charges may have more to do with billing practices than sicker patients.