acts under which we can claim medical payment from central government.

My father is retired from central government department. He got retired on december 31 2014.later he got infected from disease multiple myloma known as blood cancer on may 2015. he is treated inhospital firstly mohandai oswal hospital ludhiana then medanta the medicity gurgaun. I want to take advice how can I re-reimburse all the payments from office. any act or rule from central government can claim all the payments on treatment.