To inform efforts to improve Cambodia’s social health protection system and advance universal health coverage, health care-seeking and out-of-pocket expenditure (OOPE) were assessed using the 2016 Cambodia Socioeconomic Survey data. This study focuses on the poorest wealth quintile who reside in rural areas- the primary target population of Cambodia’s largest social health protection scheme, the Health Equity Fund (HEF). The study also estimates the proportion of poor with an Equity card which provides access to HEF benefits at public facilities.