https://www.hdfcergo.com/locators/cashless-hospitals-networks
This is about #HDFCErgo. They updated their list of supported hospitals and sent this link.
The problem is that this link seems to be blocking access to multiple ISPs. #HDFC support conveniently said that they can access this link at their end. So, I imagine that their networking guy managed to keep access enabled only for their own IPs or something.
It wouldn't be a big deal if they would just send me a PDF file but nope. They 'can't' do that! Gotta use the link!