The facility is nearly certainly incorrect. Your mother, if she is mentally competent, or her appointed attorney in fact if she is not competent has the right to leave the facility regardless of whether the doctor or facility agrees to discharge. It is very rare that this would have an affect on Medicare paying for the services already provided.
Medicare covers a medically necessary inpatient rehab stay, as determined by the doctor who "admits" you to the hospital and by the rehab staff's continuing certification that it is necessary. Medicare, too, must agree that the stay is medically necessary. But the days of your stay would not retroactively become medically "unnecessary" just because you check yourself out before your doctor officially discharges you. If your stay in the rehab was appropriate in the first place, under Medicare rules, that stay should be covered regardless of the circumstances of your discharge.
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If we take her out, and it turns out down the road, that she needs to be readmitted to the hospital or rehab center for a medically necessary reason, can they Medicare or her insurance refuse to pay for this future visit. Or can the staff refuse to treat her , etc... Isn't there something wrong with the fact that we don't know who is in charge of her case. My father visits her at the rehab center every day.
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