###HUMAN: what is the number of patients whose primary disease is brain mass;intracranial hemorrhage and procedure icd9 code is 8856?, ###ASSISTANT: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id WHERE demographic.diagnosis = "BRAIN MASS;INTRACRANIAL HEMORRHAGE" AND procedures.icd9_code = "8856"