Wiki Physician billing: inpatient, observation, or outpatient

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Gainesville, FL
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Hospital encounter order was initially inpatient.
Stay was later determined unmet for inpatient, but could not change status to observation since patient already discharged.
Hospital billing is set to bill for ancillary only.

For physician billing, which set of E/M codes should be used? Inpatient 99221-99223, observation 99218-99220, or outpatient 99211-99215?
 
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