The study asked whether neighbourhood socioeconomic disadvantage predicts mortality beyond clinical risk adjustment. It used a 20% sample of 2018 to 2019 Medicare claims covering 4,477,014 beneficiaries. Exposures were beneficiary-level Hierarchical Condition Category (HCC) score components and Area Deprivation Index (ADI) decile. Excess mortality was 0.5 percentage points higher in the most deprived ADI decile than the middle decile. The 95% CI was 0.4 to 0.6 percentage points. The design was cross-sectional and retrospective, and deprivation was measured at area level rather than for each person.
Why it is interesting: Medicare payment models already adjust benchmarks using area deprivation indices. This study tests whether that adjustment captures mortality risk that clinical HCC scores miss.
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