Data discrepancies in healthcare signups could affect coverage for 2.1 million people, the Associated Press is reporting, relying on an internal government presentation. That means one in four Americans who signed up for health insurance online may find their coverage isnt quite what they thought it was. The data problems involve income reporting as well as citizenship and immigration status, the AP says, and may mean that some people were wrongly granted subsidies. The law actually anticipated there would be problems with verifying eligibility, allotting a 90-day period to resolve any discrepancies.