Favorable Selection, Risk Adjustment, and the Medicare Advantage Program

Wiley: 10/22/12


To examine the effects of changes in payment and risk adjustment on (1) the annual enrollment and switching behavior of Medicare Advantage (MA) beneficiaries, and (2) the relative costliness of MA enrollees and disenrollees.


From 1999 through 2008 national Medicare claims data from the 5 percent longitudinal sample of Parts A and B expenditures.

Study Design

Retrospective, fixed effects regression analysis of July enrollment and year-long switching into and out of MA. Similar regression analysis of the costliness of those switching into (out of) MA in the 6 months prior to enrollment (after disenrollment) relative to nonswitchers in the same county over the same period. Read more