This study thoroughly investigates the vital role of organisational integrity culture (OIC) in Malaysia's private healthcare sector, highlighting the complex interplay between employee integrity performance (EIP) and the resulting competitive advantage derived from effective integrity practices. By combining resource-based and ethical theories into OIC, the research emphasises its strategic importance as a fundamental asset driving competitive advantage by cultivating integrity practice and boosting EIP. The study aims to analyse model fit and quantify significant construct correlations. Research inquiries, objectives, and hypotheses focus on understanding the influence of OIC on integrity practice, the impact of integrity practice on EIP, and the mediating role of integrity practice in the OIC-EIP relationship. SmartPLS provides methodological rigour in study design, target population delineation, sample, and reasoning. The study also seeks to fill gaps in private healthcare ethics literature and better understand how OIC affects staff ethics. Through empirical investigation, the study pioneers the exploration of the relationship between OIC and EIP in Malaysia's private healthcare sector, utilising the Malaysian Institute Integrity Index to illuminate this association. Ultimately, the researcher expects the findings to provide actionable insights for improving EIP through effective integrity practices while highlighting the critical role of organisational resources in sustaining competitive advantage.