Ongoing concerns with data files: After a rapid repair effort, it's clear that the front-end of the website is working much better. However, insurers remain concerned that ramping up enrollment will only exacerbate the site's unresolved back-end problems—some of the 834 forms they've received continue to contain inaccurate or incomplete data. (Sophie Novack at National Journal reports that about 33% of individuals who have signed up for health plans, although the White House has denied that number. A CMS spokesperson instead said that 80% of problems with 834 files stemmed from a single bug, which has since been fixed.)

Questions facing insurer payments: Meanwhile, CMS still needs to finalize the part of HealthCare.gov that actually transfer subsidies to insurers for plans purchased through the site. A planned short-term workaround? Daniel Durham, vice president for policy and regulatory affairs at American's Health Insurance Plans, told Reuters that insurers will estimate how much they are owed and then submit that figure to the federal government. Once the site's payment mechanisms are completed, the government and the insurers will reconcile the estimates with actual payment.