
This study compared beneficiary characteristics and Medicare per capita expenditures among seriously ill Medicare accountable care organization (ACO) populations defined using prospective and retrospective claims-based attribution methods.

This study compared beneficiary characteristics and Medicare per capita expenditures among seriously ill Medicare accountable care organization (ACO) populations defined using prospective and retrospective claims-based attribution methods.

Significant populations of seriously ill individuals are insured by all lines of business and have meaningfully different needs and medical histories in California.