Marilyn Tavenner, administrator of the Centers for Medicare & Medicaid Services, which oversees the Federal EHR Incentive Program and is in charge of the transition to ICD-10, announced Friday she would be stepping down in February.

Her tenure at CMS was also marked by the disastrous roll-out of the HealthCare.gov website, and continuing controversies around the Affordable Care Act, such as her recent acknowledgment that certain enrollment numbers were miscalculated.

"It is with sadness and mixed emotions that I write to tell you that February will be my last month serving as the administrator for CMS," wrote Tavenner in an email to staff. "I have great pride and joy knowing all that we have accomplished together since I came on board five years ago in February of 2010."

CMS Principal Deputy Administrator Andrew Slavitt will take over as acting administrator.

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[See also: EHRs 'transforming' care, says Tavenner]

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[See also: What happened to Healthcare.gov?]