Objective: To depict the discrepancy and analyze the difference between hospital cost and INA-CBGs claim in obstetrics’ cases in SoE Rural General Hospital, Timor Tengah Selatan regent, East Nusa Tenggara. Methods: This is an observational descriptive study using medical record documents of spontaneous vaginal, assisted vaginal, and cesarean delivery cases from the period of October to December 2022. We included all completed billing documents on that period. Cases paid by fee-for-service and local government were excluded. Data analysis was conducted using IBM SPSS Statistic 23.0 Results: From the total of 323 delivery cases recorded in SoE Rural General Hospital, only 245 cases were included. Most subjects were patients aged around 30 years old, referred from primary healthcare facility in the district, were in term pregnancy, and in 3rd class inpatient rooms. The median of length of stay (LOS) in vaginal delivery (spontaneous and assisted) and cesarean delivery were 2 days and 3 days, respectively. Mean difference between hospital cost to INA-CBGs claim was 67% to 158% for either vaginal or cesarean delivery based on class inpatient room. We found that hospital cost was always higher than claim cost based on INA-CBGs claim. Conclusion: There is a significant discrepancy between hospital cost and INA-CBGs claim (from 67% to 158%) for obstetric services in SoE Rural General Hospital. © The Author(s) 2023.