The company said that it was “continuing to operate normally.”
“We have been informed by Oscar’s family that he was admitted to the hospital on Thursday and we will provide further details as appropriate,” the company said.
“Our thoughts and prayers are with his family and we are respecting their privacy.”
Munoz took over from Jeff Smisek, who stepped down last month in light of an investigation into potential corruption.
Shares in the company closed 3% down at $55.97 on Friday.