The underlying assumption is that patients that are coded as sicker in claims and administrative data are always, in fact, sicker. That assumption is wrong. The bad news is that a lot of research, performance measures, and plan payments are, therefore, biased. The good news is that we now have a way of addressing the problem. For more, read my latest at the AcademyHealth blog.
The Incidental Economist
the health services research blog
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