Decompressive craniectomy (DC) is a surgical modality sometimes used in the management of elevated intracranial pressure. Questions remain as to its long-term benefits in traumatic brain injury patients. The extended Glasgow Outcome Scale (eGOS) is a scoring system based on a structured interview that allows for consistent and reproducible measurement of long-term functional outcomes. The purpose of this study was to determine the eGOS score of postcraniectomy patients after discharge and stratify survivors based on outcome. A multicenter review of patients who underwent DC was performed. Survivors underwent a phone survey at which time the eGOS was calculated. Patients with an eGOS ≥ 5 were considered to have a good functional outcome. Fifty-four patients underwent DC. Age (OR 1.038; confidence interval 1.003-1.074) and Glasgow Coma Scale (OR 0677; confidence interval 0.527-0.870) were predictors of mortality. Patients who were available for follow-up (n = 13) had poor functional outcomes at discharge (eGOS = 3); however, this improved at the time of follow-up survey (eGOS = 5; P = 0.005). DC is a controversial operation with high mortality and uncertain benefit. Among our cohort, the eGOS score was significantly higher at follow-up survey than it was at discharge. Although the mortality was high, if patients survived to discharge, most had a good functional outcome at follow-up survey.