Can a company consolidate open accounts and add to a court ordered judgement?

Question Details: I was court ordered to pay back a debt I owed on an account for a hospital. According to my records it should be paid off, however when I called the collection agency, they informed me that I had three other open accounts so they consolidated them and added on interest to what I owe. Are they able to do that considering the court order was only for the one account and was for a specific dollar amount to pay back.

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