If the hospital bill is higher than your coverage under "Cashless Everywhere," your insurance will pay the approved amount. You'll be responsible for the remaining balance. It's wise to check coverage limits beforehand and discuss any extra charges with the hospital.
For more details:-https://bankingvidhya.com/the-general-insurance-council-has-introduced-the-cashless-everywhere-initiative-providing-cashless-facilities-across-all-hospitals/