(Bloomberg) — Marilyn Tavenner, head of the U.S. Centers for Medicare and Medicaid Services, plans to step down at the end of February, she told her staff in an e-mail.

Tavenner didn't say why she was leaving. Andy Slavitt, a former UnitedHealth Group Inc. executive who is the agency's principal deputy administrator, will move into Tavenner's job on a temporary basis, Health and Human Services Secretary Sylvia Mathews Burwell said in a separate e-mail to staff.

In November, Tavenner acknowledged that her agency had made a mistake in its calculation of the number of people enrolled under Obamacare. About 393,000 individuals with both health and dental coverage were "inadvertently counted twice," she said in a letter to Representative Darrell Issa, a California Republican whose committee discovered the error.

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