Yeah, for some people listing serious medical issues would be much more important. I mentioned above that everyone I know that wears such an ID uses insulin. And if an EMT encounters someone unconscious on the side of the road, that would be a very important thing for them to be aware of because that tells them what the first test should be. I also mentioned above that I used to camp with a friend that had a severe bee sting allergy, a bad sting could kill him, thus that allergy would be something to list on an ID.

I have some medical issues too, but none of them would put me in a life threatening condition and if I missed my prescription meds for a few days, it would not cause any real harm. I ordered an ID yesterday, decided to only list name, birthdate, and emergency contact phone number. I included the acronym USA with my contact phone number so the ID would still function as desired if I was outside of North America.

Or more simply, put on it what an ambulance crew or emergency room staff need to know, everything else is a distraction in an emergency.

When I ordered one yesterday, in my search I found a few that could include a QR scannable code. If you had more info that they need to know, I have no clue if an ambulance crew can read something like that but I assume an emergency room does. That might be worth researching. Here is where I saw the QR Code.
https://shop.getmyid.com/collections...id-sticker-kit

Or, if more info in written format is sought, this was an option I also saw yesterday:
https://www.vitalid.com/product/medical-id-bracelets/

The one I bought yesterday is one that you should be able to run a dog collar through, I hope if fits well on my watch band. If not, it was cheap and I can buy something else.

If I buy another, it would probably be a neck dog tag type one but I am not sure if I would remember to use it when I go for bike rides so that was not my first choice.