The new health reform law takes effect today but not one of the most disputed parts.
An 11th hour stay is halting a birth control provision of the law.
Supreme Court Justice Sonya Sotomayor has temporarily blocked a provision in the Affordable Care Act.
It would have required some religious affiliated groups to cover birth control for their workers.
Organizations that didn't comply with the law could have faced thousands of dollars in fines.
A catholic group based in Denver requested the stay.
Women's rights groups expect the courts to uphold the law.
"Having access to contraception is a fundamental health issue for individual women," said National Women's Law Center, Marcia Greenberger.
In June, a US circuit court of appeals waived millions of dollars in fines against the store hobby lobby.
The company argued the mandate violated their Christian values.
The justice department has until Friday to respond.