Oh boy, all that time spent signing up to not be signed up.
Check this out:

The Obama administration announced Friday that enrollment records for one in four Americans who selected health plans on HealthCare.gov in October and November could contain errors, raising concerns that consumers who think they have coverage won’t actually be enrolled on Jan. 1.

Centers for Medicare and Medicaid Services spokeswoman Julie Bataille said recent fixes to HealthCare.gov have brought the error rate on forms sent to insurance companies down to about one in 10 for files generated after Dec. 1, The Wall Street Journal reported.

The electronic files, known as 834 forms, give insurance companies basic information about would-be customers, including their name, address, contact information and Social Security number. Insurance companies have reported issues with the files since the law’s rollout.