I agree, there isn't a 'form' you can get off line because every enforcement procedure is unique. Also, if you get one filed, be sure to have the violator served with a copy and notice of hearing by a process server, otherwise the judge will be powerless to hold him in contempt. Getting an attorney to help you is the best way to proceed.
Enforcement pleadings can be complicated. If you do not file correctly, you can lose your case. Additionally, enforcement of medical expenses increases the difficulty of your case. You can try to contact the child support office to see if they will pursue the enforcement, if not, I would try to talk with an attorney. I do not encourage non-lawyer to file these types of actions.