Background: The incompleteness of medical record filling is a problem for health care facilities. Objective : To assess the role of accreditation in medical records completeness at Firdaus Clinic Methods: A retrospective study was performed to assess the role of accreditation in medical records completeness at Firdaus Clinic. A total of 320 medical records registered during November2016-July2018. The assessment based on Minister of Health Regulation No.269/MENKES/PER/III/2008, education and monitor of drug side effects. The result divided into initial phase after accreditation commitment (phase 1), preparation phase (phase 2), final phase (phase 3), and improvement phase (phase 4). Each phase showed in 6 months, phase 4 in 3 months. Result: There are 23% medical record complete proofed. The records filled complete in date and time, identity, history and treatment. The lowest percentage showed in vital sign, education and monitoring drug side effects. In phase 2, there is a decrease on vital sign, physical examination and education. In phase 3, there is an increase in physical examination and education. In phase 4, there is an increase in vital sign and education. Conclusion: Enhancement of health worker behavior to fulfill medical record needs to be done continuously to improve the quality of performance. Keywords: medical record, accreditation, phase