I hope this message finds you well, present circumstances excluded. I am a licensed attorney with over a decade of employment law experience. It is a pleasure to assist you today.
The first thing you, or your attorney, should do is to place them on legal notice of their deficiency and demand payment. This can be accomplished by sending them a certified letter with a return receipt wherein you notify them of the situation and the delinquent payment to you and to the health care provider. Tell them they must pay within 10 business days of the post mark on the letter or you will take them back to court and seek attorney fees and damages.
You may want to attach a copy of the court order to pay as an exhibit as well.
If they do not pay within the specified period of time, you are going to have to take them back to court and you can seek attorney fees associated with their delinquency. The certified letter of legal notice will bode well for you before the court because it will be evidence of you attempts to solve this without court intervention.
Also, contact the anesthesia provider and let them know what is going on as well. You may want to give them a copy of your letter to show your diligence in pursuing the payment to hold them over until payment is made.
Let me know if you have any other questions or comments. Please also rate my answer positively (three or more stars) as well.
Best wishes going forward!