I am paying the hospital 20 dollars a month and they want more
Social Security Lawyers
Yes, any creditor can enforce a right to be paid in full by seeking a judgment. With that judgment a creditor can garnish wages and bank accounts, and attach non-exempt properties. Any payment agreement is strictly a matter of courtesy on the part of the creditor, and the debtor has no power to decide what the payment will be.
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This answer is offered as a public service for general information only and may not be relied upon as legal advice.