(iii) Clinical variables
Hospitalized patients with WAS were identified with anInternational Classification of Disease – ninth revision (ICD-9)
code of 279.12. Among these patients, those who underwent HCT were
identified using ICD-9 diagnosis code of V4281 and DRG version 24 of
481. Data collected included patient age, sex, race, death during
hospitalization, length of stay in days, elective admission, number of
procedures, total charges for the admission, location of the patient and
primary insurance status (Medicare, Medicaid, Private Insurance and
Self-pay). All ICD-9 codes listed under diagnosis were reviewed to
identify complications associated with WAS and complications associated
with HCT.