how many times have patient 75762 been treated with lumb/lmbsac fus ant/post on their first hospital visit?
select count(*) from procedures_icd where procedures_icd.icd9_code = ( select d_icd_procedures.icd9_code from d_icd_procedures where d_icd_procedures.short_title = 'lumb/lmbsac fus ant/post' ) and procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 75762 and admissions.dischtime is not null order by admissions.admittime asc limit 1 )