Angela Minicuci, a spokeswoman at the Michigan Department of Community Health, said the state is working with the federal government to address technology issues. She said Michigan has enrolled 323,000 residents into the Healthy Michigan Plan, exceeding its 322,000 target for the year.
"We will continue to work to ensure Michiganders have access to health care coverage needed to lead healthy, productive lives," Minicuci said.
Missouri said its staff had completed 39,000 of the 51,600 applications that have come through the federally run marketplace since February. Joseph Parks, director of the Missouri Department of Social Services, said only 8 percent of those applicants have been found to be eligible.
"The current transfer standards would appear to give too many applicants a false expectation of coverage under Missouri's Medicaid Program," Parks wrote in his response Monday.
The states facing the federal deadline are a mix of those that opted to expand Medicaid under the Affordable Care Act and those that did not.
Obama's health reform law led to the signup of about 8 million people in private health care coverage through the insurance exchanges, while an additional 3 million people enrolled in Medicaid, the state-federal program for the poor and low-income.
The federal government initially picks up the full tab for the Medicaid expansion, which was accepted by about half the states.
Associated Press writers Becky Bohrer in Juneau, Alaska, Maria Fisher in Kansas City, Missouri, and Roger Schneider in Detroit contributed to this report.