Here in Brazil, this system exists, but without a blockchain, and it works very well. It tracks vaccinations, surgeries, when you went to a hospital or a basic health unit (it’s like a mini hospital for check-ups, vaccination and less severe stuff), etc.

I went to a doctor recently (that I never went before) and he started asking things like “so you broke your arm on 2003? Interesting”.

So I would say that blockchain might not help in that area either haha.