Marilyn Tavenner, head of the U.S. Centers for Medicare and Medicaid Services — the agency largely behind the rollout of the Affordable Care Act —plans to step down at the end of February, she told her staff in an email Friday.

Tavenner didn’t say why she was leaving. In November, Tavenner acknowledged that her agency had made a mistake in its calculation of the number of people enrolled under the ACA. About 393,000 individuals with both health and dental coverage were “inadvertently counted twice,” she said in a letter to Rep. Darrell Issa, a California Republican whose committee discovered the error.

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