Public Health Spending and Medicare Resource Use: A Longitudinal Analysis of U.S. Communities.

OBJECTIVE: To examine whether local expenditures for public health activities influence area-level medical spending for Medicare beneficiaries. DATA SOURCES AND
SETTING: Six census surveys of the nation's 2,900 local public health agencies were conducted between 1993 and 2013, linked with contemporaneous information on population demographics, socioeconomic characteristics, and area-level Medicare spending estimates from the Dartmouth Atlas of Health Care. DATA COLLECTION/EXTRACTION: Measures derive from agency survey data and aggregated Medicare claims. STUDY
DESIGN: A longitudinal cohort design follows the geographic areas served by local public health agencies. Multivariate, fixed-effects, and instrumental-variables regression models estimate how area-level Medicare spending changes in response to shifts in local public health spending, controlling for observed and unmeasured confounders. PRINCIPAL
FINDINGS: A 10 percent increase in local public health spending per capita was associated with 0.8 percent reduction in adjusted Medicare expenditures per person after 1 year (p < .01) and a 1.1 percent reduction after 5 years (p < .05). Estimated Medicare spending offsets were larger in communities with higher rates of poverty, lower health insurance coverage, and health professional shortages.
CONCLUSIONS: Expanded financing for public health activities may provide an effective way of constraining Medicare spending, particularly in low-resource communities. © Health Research and Educational Trust.