Background: Since 2014 Indonesia has implemented National Health Insurance as a social insurance. The JKN payment scheme is no longer a fee for service but use Ina CBG's tariff scheme. Under the Ina CBG‘s, the payment rate for DM type 2 patients is generalized (Rp 185,000 per visit) although DM patients with complications required higher cost. This study is intended to determine the relationship between DM complications with medical cost. Method: The research was done analytically and cross sectional. Secondary data is taken from medical record and details of patient care cost of DM JKN Non PBI at Outpatient Installation of Internal Disease RSI Jombang period 1 January 2014 to 31 December 2016 by total sampling method. A total of 626 samples met inclusion and exclusion criteria. The results were analyzed by non parametric test.. Result: There was a significant correlation between complication and and hospital visit in a year (p = 0.000). The highest average medical cost per visit was found in DM without complication (Rp 154,626) while the lowest was found in DM with both microvascular and macrovascular complication (Rp 123,664). There is negative and signifficant correlation between type and number of DM complication and medical cost (r = -0.199, r = -0.247, p = 0.000). Both medical cost still under Ina CBG‘s claim. Conclusion: DM type 2 with complication needs higher cost but hospital was able to manage the cost efficiently. But this may affect the quality of treatment. Government, hospital and physician must take further consideration. Keywords: Cost, Diabetes Complication, Ina CBG‘s, JKN