The IRS is showing his SSN with marketplace insurance. You will need to fill out a form 1095-a for him. Contact the ex or www.Healthcare.gov or call 1-800-318-2596 (TTY: 1-855-889-4325). Available 24 hours a day, 7 days a week (except holidays).
See here for more help. You definitely want to pro-rate his share so that you have no tax due. There are lots of help articles here in Community. Once you know more, you can reply with more information.
IRS information:
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