You can bill the whole 30 days on one form. You don't have to list each provider they say. Usually there is one that is 'in charge' of the patient's care. For example a dr or psychiatrist is overseeing all care, but the patient sees several counselors during their stay. Not all rev codes have corresponding cpt codes, such as the room & board rev codes. I never used value codes when doing inpatient rehab. As for the type of bill, some insurance carriers may require a different type of bill than another carrier, but the 891 looks appropriate. You may also want to look at 861.
Michele