ABSTRAK SIM RS di RSU Bali Royal sudah digunakan sejak tahun 2010. Tetapi pemanfaatan SIM RS masih belum optimal. Tujuan penelitian adalah untuk mengukur efektivitas implementasi SIM RS di RSU Bali Royaldengan menggunakan indikator PIECES ( Performance, Information and data, Economics, Control and security, Efficiency, Service ) di evaluasi dari sisi Informasi yang bisa dihasilkan. Rancangan penelitian yang digunakan adalah System Assessment Method. Pengumpulan data dilakukan dengan wawancara mendalam ( Indepth Interview ) menggunakan pedoman wawancara. Berdasarkan hasil wawancara mendalam dan telaah dokumen yang telah dilakukan, didapatkan hasil kinerja SIMRS RSU Bali Royal dari sisi informasi berdasarkan performance sudah baik diketahui dari indikator throughput dan respond time, dari information sudah baik bila dinilai dari outputs, inputs serta stored data, secara economics sudah baik, dari cotrolling and security keamanan data masih kurang, dari segi efficiency informasi yang didapatkan di SIMRS sudah baik, dari segi service bahwa SIMRS RSU Bali Royal sudah baik. Saran penambahan server, penerapan elektronik rekam medis, mengintegrasikan sistem dengan peralatan yang ada, adanya log out otomatis dan pemantauan rutin implementasi SIMRS ke seluruh unit. Kata kunci: Sistem Informasi Manajemen Rumah Sakit ( SIM RS ), Efektivitas, Informasi, Metode PIECES. Hospital Management Information System ( HMIS ) in Bali Royal Hospital has been used since 2010. But the utilization of HMIS is not optimal. The purpose of this research is to measure the effectiveness of HMIS implementation in RSU Bali Royal by using PIECES indicator (Performance, Information and Data, Economics, Control and security, Efficiency, Service) from the Information that can be provided by HMIS. The research design is System Assessment Method. Data collection was done by in-depth interviews (Indepth Interview) using interview guidelines. Based on the results of in-depth interviews and data processing, the results is performance of HMIS in Bali Royal in terms of information seen from the performance is good known from the throughput and respond time indicators, from the information is good assessed from outputs, inputs and stored data, economics is good, from controlling and security data security is not good , in terms of information efficiency obtained in HMIS is good, in terms of service that HMIS Bali Royal Hospital is good. Suggestion of server addition, implementation of electronic medical record, integrate system with existing equipment, automatic logout and routine monitoring of HMIS implementation to all units Keyword : Hospital Management Information System (HMIS), effectiveness, Information, PIECES.