The maternal mortality rate in Indonesia is still high, at 305 per 100,000 live births. Several studies indicated maternal financial burden as one of the dimensions of access that influence a pregnant woman's ability to receive adequate, high-quality medical care. This study aims to identify the association between the use of Indonesia's national health insurance (JKN) and out-of-pocket (OOP) expenditures in accessing delivery services, using data from the Indonesian Family Life Survey 5. In addition, this study also investigated the relationship of JKN and the potential reduction of catastrophic delivery expenditures (CDEs) for delivery services. The results show that JKN was associated with reduced OOP expenditures for delivery as well as reduced risk of incurring CDE. However, some OOP expenditure for cost of delivery services still exists among mothers who used JKN during delivery, potentially due to factors such as medicine stock availability and inpatient care shortages.