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In outpatient data, the patient reason for visit (DX_VISIT_REASON) is should be coded for all unscheduled visits. DX_VISIT_REASON is an ICD-9-CM diagnosis code.
Diagnoses are compared to a list of ICD-9-CM codes valid for the discharge date. Anticipation of or lags in response to official ICD-9-CM coding changes are permitted for discharges occurring within a window of time around the official ICD-9-CM coding changes (usually October 1). Beginning in the 1998 data, a year window (six months before and six months after) is allowed. Invalid diagnoses are set to "invl"
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