Provision for Section 17(2) Certificate for Medical Benefits Exemption

Now a days various hospitals are receiving email from TPA for getting confirmation whether they have certificate under proviso (ii)b of section 17(2) and hospital are like what is this provision? And were do we get that registration? Why this registration is not there? Does my existing business would affect due to not having certificate under proviso (ii)b of section 17(2)?. To address such tricky questions I endeavour to write about this issue in simple words.