Are you seeking relationship question assistance or did you want legal idvice? If the former, please elaborate.
Thank you for clarifying. It would be worth the trouble to talk to him only if you 1/ believe he would have some epiphany 2/ you just want to take it off of your shoulders despite his reaction.
Try to find out if the medical records can be subpoenaed. Your father may not have the info or he may not understand what it says.
He will remain the person he is most likely. You've got to decide if by communicating with him this is more helpful than hurtful to you. If you're able to forgive and accept that this is how he is, then the communication would be something in the way of closure or moving along for you.
You may want to write down what is it that you want to say (keep it neutral if you can) and then either mail it or tell that to him (best if it is done in person)