Might be super specific to my country, but antibiotics are for example given on a staircase hierarchy here to avoid resistance. This means that if one does not work, you need to go to the doctor again to ensure you get the right next step.
Same for percentages of strength in medicine. If a certain percentage strength of tretinoin does not work, you need to get a new prescription for the stronger one.
Another thing are different providers. If you get care at one provider they won't have the data of the other providers necessarily.
---
None of these things are insurmountable and would just require some good software to fix(connect databases, make hierarchies of medicine, etc) However it's in no-ones incentive to do so.
The doctors, nurses and other medical staff have 0 interest in:
1) making themselves obsolete
2) learn new software systems
3) change their workflow
And will not only express this, but also actively misuse the new tools that they are given (happened in my country) to make a point of how things can't be trusted and why they are necessary.
In order to solve this you need something like the solution proposed coming in from the outside. This way the current medical staff have 0 control and have to change/adapt.