Shiddieq, H.A., Soenaria, S.R. and Handoyo, S. 2025. Applying Lean Methodology to Optimize Patient Flow in JKN Outpatient Services: Evidence from a Cardiac Hospital in Indonesia. International Journal of Science and Society. 7, 2 (Jul. 2025), 488-501. DOI:https://doi.org/10.54783/ijsoc.v7i2.1461.