The Dutch government Health-ICT organization Nictiz, has a website with 112 health related standards. It has figures of usage, classifications and links, and some intelligence in selecting subsets. (in Dutch)
They did not have OpenEHR and HISA mentioned, but after me informing them yesterday evening, they are going to add them. This because OpenEHR is commercially implemented in the Netherlands by Code24 and some others, and HISA is a CEN standard. So both are important to have on that site.
I hope foreigners can understand the website too, because it is a good overview, and there are lots of international keywords in the description.
Maybe if someone also misses a standard (does not need to be ISO or CEN, defacto is also good), tell me (with links) and I will inform them, or you can inform them yourself.
https://www.nictiz.nl/standaardisatie/overzicht-standaarden
best regards
Bert Verhees