The federal government is giving Americans six additional weeks to sign up for health insurance.
The extension advances the deadline for Americans to obtain coverage from mid-February until March 31.
The change is a response to technical problems that have plagued the Affordable Care Act's rollout and its website.
A White House spokesman says it should help resolve a "disconnect" in the law's implementation.
Under the new policy, people who do not sign up for health insurance by the end of open enrollment period would face a penalty.