Hospitals come under the Shops and Commercial Establishments Act, and therefore, are covered by the Payment of Bonus Act and other labor enactments such as the Payment of Wages Act, Minimum Wages Act, Employees' Provident Fund and Miscellaneous Provisions Act, Maternity Benefit Act, etc.
If charitable institutions are to be exempted from the operation of labor laws, there cannot be found any establishment that is non-charitable on paper!
Regards, Madhu.T.K