Julie Appleby | KFF Health News Unauthorized switching of Affordable Care Act plans appears to have tapered off in recent weeks based on an almost one-third drop in casework associated with consumer complaints, say federal regulators. The Centers for Medicare & Medicaid Services, which oversees the ACA, credits steps taken to thwart enrollment and switching problems that triggered more than 274,000 complaints this year through August. Now, the annual ACA open enrollment period that began Nov.