You don't enter 1095-C on your tax return. Health insurance coverage is no longer mandatory on the federal tax return. But some states do charge a penalty for not having coverage. The CP11 should explain why you owe $867. IRS adjusted your refund due to a miscalculation on your return.
Check your return to see if the IRS' change is correct. If you agree with the change, pay the balance due, but if you don't agree to the change, you can always challenge it.
Understanding your CP11 Notice.
@Jason Rudy
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