I assume you previously filed a motion for contempt. If you want to add an additional basis for holding your ex in contempt, you can generally do so by amending your previously-filed motion to include the new allegations. You can then file a notice of hearing on your "Amended Motion for Contempt," as opposed to the original motion. You have to do this a reasonable time before the scheduled hearing. And, there has to be adequate time set aside to hear all of the issues. Normally, if the court cannot hear all of the contempt issues at the scheduled time, the remainder can be heard at the final hearing. Make sure that there is an express provision in a temporary order, parenting plan, or final judgment that prohibits changing the child's doctor. Absent express language, many judges are hesitant to find a parent in contempt, as a contempt finding requires a willful violation of a clear order. Of course, even in the absence of express language, you could file a motion to prohibit it from happening again.
As for adding additional contempt expenses to your motion for consideration by the court, if you wish to make it a part of the court record so it doesn't appear "new" to the judge you can file a copy of the receipts of these documents with the court under a Notice of Filing Supplemental Expenses for Consideration in pending Motion for Contempt, for instance.