Yes, your credit will be impacted if he runs up new charges on jointly held accounts. Close all joint accounts with your soon-to-be-ex-spouse immediately. You may also want to contact the three credit bureaus and have a fraud alert attached to your credit report. If a fraud alert is attached to your credit report, a lender should contact you by phone to verify that you want to open a new account.
Seek legal assistance from your divorce attorney for questions relating to the proper procedure for checking a spouse's credit report and payment of medical bills. There may be state-specific issues that your attorney may need to address as well.
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