Sorry, but this is simply not on unless the access is agreed to by a judge who issues a specific warrant. If there is real need for the information then obtaining a warrant will not be an issue, but unless a judge can be persuaded the confidentiality of all clinical information should be preserved under pain of severe penalty for breach.
At present in NSW there is a reasonable barrier - i.e. a real need to know - to the sharing of health information - but laws vary at Commonwealth and different state levels. My strong preference is that there be a national, consistent and pretty tough regime in place. As far as I can see there is presently no reference to health information held by medical practices in the report but it seems that all hospital encounter records are fair game.
(In passing I note the article provoked 34 mostly very annoyed comments!)