Having that taxonomy is definitely a great starting point for the field, but just to build a model to extract patient data from the text of a medical record you'd need to:
* Procure patient medical files. This rabbit hole includes things like HIPPA compliance and sufficiently anonymizing the files. Also, hospitals consider 3 years of information on 100 patients to be a lot of data.
* Have trained medical professionals annotate the files. Good luck convincing doctors to do this. Also good luck in determining what to do if the handful of doctors you're granted a few hours with a week can't agree on annotations.
* Actually produce a model that is reasonably good at pulling information out of patient charts,
Even after all the above, you still only have a solution that is giving you structured data, which is something that other EMRs can provide w/o the problems of accuracy & completeness of NLP process. There is still the process of diagnosis and treatment and also the fact that this is all a loop ('active learning').