screening patient in er setting

we had a patient brought to the ER from our adjoining Nursing Home due to the fact that the resident's son thought the patient did not look "right" - nothing was found-should we use the V71.89 or use one of the diagnoses the patient has in the NH? any input would be appreciated

use the symptom

there must have been something- lethargy, fever, pallor, etc. I would also talk to the nursing home about their assessment methods.