Introduction: Clinical wastes produced by health facilities were considered as scheduled waste listed in the First Scheduled of the Environmental Quality (Scheduled Waste) Regulation 1989. The management of clinical waste in all government hospitals in Sabah were outsourced to private concession company. Until now, there was no research being done in Sabah to evaluate it. Methods: This cross-sectional study was carried out on eight concessionaire com-panies located inside accredited non-specialist government hospitals in West Coast Division & Interior Division of Sabah. Data collected through Clinical Waste Management (CWM) Scores and Questionnaires. CWM scores adopt 5 elements of accreditation standard produced by Malaysian Society Quality in Health (MSQH). Questionnaires were used to collect concessionaire staff’s basic personal data, services and activities related to clinical wastes ac-cording to MSQH standard. Response from questionnaires were used to compare and support result gained from CWM scores. Descriptive analysis was used to analyze the data. Results: Two concessionaire companies got overall CWM scores ranging between 86% - 90%, while the other six companies were above 95%. It happened because both companies gained 81% and 73.3% on Policies and Procedures element. Result from questionnaires answered by 67 concessionaire staffs showed 98% of staffs had attended meeting, 97% had received an orientation, 97% had received training related to clinical wastes, 95% agreed that their work was monitored and no occupational disease and injury recorded between January to April 2019. These result correlate with CWM scores gained under Orga-nization Management element (99.6%), Human Resource Management element (90.1%), Facilities and equipment element (97%) and Safety & Quality Improvement element (100%). Conclusions: All concessionaire companies were implementing excellent clinical waste management in hospitals. CWM scores can be used to rank individual conces-sionaire company and provide pattern of uniformity or non-uniformity of the clinical waste management in Sabah.