The Kentucky shift to HealthCare.gov could cause big problems for enrollees, a top federal official says.

Matt Bevin, Kentucky’s Republican governor, is now making good on a campaign promise to shut down Kynect, the state’s Affordable Care Act public exchange system.

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Kentucky wants to send residents to HealthCare.gov, the ACA exchange enrollment and coverage administration system that the U.S. Department of Health and Human Services set up to provide ACA exchange services for states that are unwilling or unable to provide the services themselves.

The ACA individual open enrollment period for 2017 is set to start Nov. 1 and end Jan. 31.

The Centers for Medicare & Medicaid Services (CMS) is the HHS agency in charge of HealthCare.gov.

Kentucky showed during a two-day review in September that it’s prepared to send account information and other information to HealthCare.gov, Andrew Slavitt, the acting CMS administrator, wrote in a letter to Bevin Tuesday and posted on the CMS website.

CMS will let Kentucky switch to HealthCare.gov effective Nov. 1, Slavitt says.

But Slavitt says the Kynect-to-HealthCare.gov shift could lead to long re-enrollment delays for some Kynect users.

“Many applicants will have to begin their application in one place and then experience a waiting period while their application is transferred and processes,” Slavitt writes. “They will then have to complete that application and enrollment on a different platform.”

To avoid enrollee service nightmares, Kentucky has to give its consumers the information they need to use HealthCare.gov by Nov. 1, Slavitt says.

“We will also review performance indicators around timeliness of transaction processing and backlogs to monitor the degree to which eligible people obtain coverage in a timely manner and will continue to work with you to resolve any gaps in coverage,” Slavitt writes.

Related:

Kentucky governor starts to shut down exchange

View: More red states open doors to Obamacare

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