A new topic at the Obamacare website is entitled "How do I report life changes to the Marketplace?" Although most life changes can now be reported online at Healthcare.gov or over the phone with a customer service representative, the final paragraph alerts consumers that any changes in contact information must be reported twice [emphasis in original]: "To change your home address, email address, or phone number, update the information on your Marketplace Profile page. Be sure to report address, email, and phone changes to your insurance company too. Otherwise they may not know about your new contact information." Here's a partial screenshot of the page:
Note: A version of this post first appeared at The Weekly Standard.