From Einav and Finkelstein (2023):
…whereas 12.5% of people beneath 65 are uninsured at a cut-off date, twice as many—one in 4—are uninsured sooner or later over a 2-y interval. Furthermore, the chance of shedding insurance coverage remained just about unchanged with the introduction of the landmark ACA. Threat of insurance coverage loss is especially excessive for these with medical health insurance via Medicaid or personal exchanges; they’ve a 20% likelihood of shedding protection sooner or later over a 2-y interval, in comparison with 8.5% for these with employer-provided protection. Those that lose insurance coverage can expertise extended durations with out protection; about half are nonetheless uninsured 6 mo later, and virtually one-quarter are uninsured for the following 2 y.
Regardless of the passage of ACA, dependable medical health insurance within the US is de facto solely accessible to the aged, veterans and people with secure jobs.