What to do if I have a former spouse and we were ordered by our divorce decree to split the costs of medical or doctor's visits but I have fallen behind?

Question Details: Due to lack of work I have fallen behind on these costs. My ex-spouse has informed me she plans on charging me 20% on the amount owed. I don't think she can do this. What are her recourses on pursuing extra interest on medical expenses and what are mine to prevent her doing so and just repaying owed amounts.

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