The Center for Healthcare Research & Transformation has released a brief examining the impact of the national health care reform law on health coverage in Michigan.  Using a model that assumes the law was implemented in 2007/2008, the authors estimate the 5 percent more of the population would have had public coverage than without the law, at 33 percent.  The authors also estimate that 65 percent of residents would have had private coverage under the law, rather than the 61 percent who did in 2007/2008.

From the report: 

The Patient Protection and Affordable Care Act is intended to significantly reduce the number of uninsured individuals in the country. If the Act were fully implemented in 2014, and all those who were eligible for coverage and/or mandated to purchase coverage enrolled in or purchased that coverage, there would be considerable growth in both private and public sector coverage in the state. That is, while 28 percent of those in Michigan had public coverage in 2007/2008, under health reform, 33 percent would be eligible (and if all enrolled, covered). And while 61 percent of the state's population had private coverage in 2007/2008, post-reform that number could grow to 65 percent assuming all who are required to purchase coverage did so (and those who currently have employer based group coverage but would be Medicaid eligible continue to retain employer based coverage). Those who are currently covered by individually-purchased private insurance and meet income eligibility criteria for Medicaid under reform (i.e., have incomes less than 133 percent of poverty) make up one percent of Michigan's population, but it is unclear whether they would choose to enroll for Medicaid or retain their private coverage.

Full report: Impact of Health Reform on Coverage in Michigan (PDF | 992.38 KB)

Center for Healthcare Research & Transformation.  (2011).  Impact of Health Reform on Coverage in Michigan.