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Background: The post-operative morbidity and mortality after CRS-HIPEC has been widely evaluated. However, there is a major discrepancy between rates reported due to different metrics and time of analysis used., Objective: To evaluate the legitimacy of 90-day morbidity and mortality based on the National Cancer Institute's Common Terminology Criteria for Adverse Events (NCI-CTCAE) v4.0 classification as criteria of quality for cytoreductive surgery combined with hyperthermic intraperitoneal chemotherapy (CRS-HIPEC)., Methods: A prospective database of all patients undergoing CRS-HIPEC for peritoneal carcinomatosis between 2004 and 2015 was queried for 90-day morbidity and mortality and survival., Results: Among 881 patients, the 90-day major complication rate based on NCI-CTCAE classification and Clavien-Dindo's classification were 51% (n = 447 patients) and 25% (n = 222 patients), respectively. Among patients who presented with a 90-day complication based on the NCI-CTCAE classification, 50% (n = 225 patients) presented a medical complication not reported by Clavien-Dindo's classification. After surgery, 24 patients (2.7%) died of post-operative complications, for only 10 (42%) of them the death occurred within 30-day after surgery. Occurrence of major complication based on either NCI-CTCAE classification, Clavien-Dindo's classification or the medical complication not reported by Clavien-Dindo's classification all negatively impacts the overall survival., Conclusion: Among commonly reported morbidity's classification, 90-day morbidity based on NCI-CTCAE classification represents a legitimate metric of CRS-HIPEC quality. Post-operative morbidity after CRS-HIPEC should be reported using 90-day NCI-CTCAE classification.