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The decree should specify who is responsible for unisured medical - if all it says is that the receipts "should" be submitted within ten days then submitting themin10 days is not a "condition precedent" to your duty to pay and you'll have to pay them. If you're concerned, go back to court and ask judge to "modify" decree,telling him you have a budget and need to plan too and to make it so that if the bills are not submitted on time you don't have to pay at all.
All the best,