what is the first diagnosed diagnosis of patient 27172 in the current hospital visit?
select d_icd_diagnoses.short_title from d_icd_diagnoses where d_icd_diagnoses.icd9_code in ( select diagnoses_icd.icd9_code from diagnoses_icd where diagnoses_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 27172 and admissions.dischtime is null ) order by diagnoses_icd.charttime asc limit 1 )