[kayman]

Having worked previously in the healthcare sector (both USA and AUS), I must agree. There is zero incentive for vendors to work together to share patient data.

There is a standard for medical data already called HL7, but not everyone adheres to it.

What would work better is if the medical record is a service provided by the government or some public service which takes care of security for you. Every medical record would then be added to the patient's blockchain record and vendors can read/write to it.

Of course a vendor would have to vetted for security purposes.