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Insurance Dynamics During Childhood in the Fragmented US Health System.

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By age 18, most US children interact with Medicaid or CHIP, and many experience uninsurance. State policies significantly impact children

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Area of Science:

  • Health Services Research
  • Public Health Policy
  • Pediatric Health Outcomes

Background:

  • US children's health insurance is a complex mix of public and private coverage, with significant state-level disparities.
  • Understanding children's longitudinal insurance experiences, including Medicaid, CHIP, and uninsurance, is crucial for policy evaluation.
  • Prepandemic data provide a vital baseline for assessing the impact of evolving healthcare policies on child health coverage.

Purpose of the Study:

  • To estimate the dynamics of health insurance coverage, specifically Medicaid or Children's Health Insurance Program (CHIP) enrollment and periods of uninsurance, throughout childhood.
  • To analyze these insurance dynamics within the context of post-Affordable Care Act (ACA) and prepandemic policy conditions in the US.
  • To establish a baseline for evaluating future Medicaid policy changes' potential effects on children's health insurance.

Main Methods:

  • A microsimulation model projected monthly insurance coverage for 100,000 simulated US children from birth to age 18.
  • National datasets from 2015-2019, including natality records and survey data (MEPS, SIPP), were synthesized.
  • Dynamic predictors like family income, insurance history, state, and age informed monthly simulations, with bootstrapping for uncertainty intervals.

Main Results:

  • By age 18, an estimated 61% of US children were ever enrolled in Medicaid or CHIP, and 42% were ever uninsured.
  • Approximately 26% of children maintained continuous employment-based or other non-public insurance throughout childhood.
  • Children born into Medicaid/CHIP had higher uninsurance rates (59%) in non-expansion states compared to expansion states (36%), particularly in states with restrictive eligibility criteria.

Conclusions:

  • Nearly three-quarters of US children utilized publicly subsidized insurance or experienced uninsurance by age 18 in the prepandemic era.
  • Significant state-level variations in childhood uninsurance highlight the critical influence of state Medicaid policies.
  • These findings underscore the importance of state-specific Medicaid policies in shaping children's health insurance access and continuity.