As far as the insurance company is concerned, there is nothing you can do about it. This procedure involved your ex, and as you guessed, HIPPA (and other laws) prevent them from dealing with you about this. So, if your ex won't cooperate in getting the denial reversed (which may or may not be possible), then you'll either have to pay the balance owed (since you agree to do so in your decree - it was a mistake to leave the dollar amount open - it means you simply agreed to assume 100% of the debt), or take your ex back to court to get the decree modified to remove your liability for that debt due to the non-cooperation of your ex.
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I agree that you should consider going back to Court regarding this obligation. If your ex will not cooperate, causing you to owe more, then you should get the Court to order her to cooperate, and if she does not to then make payment her obligation. But hurry. These things are time sensitive.
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