Latar Belakang: Proses pre-registrasi pasien rawat inap di RS Mayapada Tangerang terdiri dari tiga fase utama, yaitu penerimaan berkas admission, review asuransi, serta konfirmasi jadwal dan persiapan pasien. Studi ini bertujuan untuk mengevaluasi proses pre-registrasi dan mengidentifikasi area yang perlu diperbaiki guna meningkatkan efisiensi pelayanan dengan.
Metode: Penelitian ini menggunakan pendekatan Lean six sigma dengan metode DMAIC (Define, Measure, Analyze, Improve, dan Control). Data dikumpulkan melalui observasi langsung, pencatatan waktu proses, dan diskusi kelompok terfokus (FGD) bersama tim terkait. Analisis dilakukan menggunakan Value Stream Mapping (VSM) untuk mengidentifikasi aktivitas bernilai tambah, serta Pareto Analysis dan Problem Tree Analysis untuk menemukan akar penyebab pemborosan dan keterlambatan.
Hasil: Analisis terhadap alur dan capaian waktu proses menunjukkan adanya ketidakefisienan, dengan total waktu mencapai 26 jam 1 menit 48 detik. Proporsi aktivitas bernilai tambah (Value added) tercatat sebesar 71%, sementara 29% lainnya tergolong Non-Value added, dengan pemborosan terbesar terjadi pada fase review asuransi akibat waktu tunggu yang panjang dan aktivitas berulang. Hasil penelitian menunjukkan bahwa intervensi berbasis Lean six sigma efektif dalam meningkatkan efisiensi, ditandai dengan penurunan lead time pada fase post-intervensi. Pada fase I dan II terjadi perbaikan signifikan, seperti penyederhanaan proses konfirmasi DPJP, percepatan verifikasi dokumen, serta pengurangan waktu tunggu pada proses review asuransi.
Kesimpulan: Penerapan Lean six sigma mampu memberikan dampak positif terhadap optimalisasi proses pre-registrasi pasien rawat inap di RS Mayapada Tangerang.

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Background        : The inpatient pre-registration process at Mayapada Hospital Tangerang consists of three main phases: admission document submission, insurance review, and confirmation of schedule and patient preparation. This study aims to evaluate the pre-registration process and identify areas that need improvement to enhance service efficiency. Method        : This research uses the Lean six sigma approach with the DMAIC method (Define, Measure, Analyze, Improve, and Control). Data were collected through direct observation, process time tracking, and focus group discussions (FGDs) with relevant teams. The analysis was conducted using Value Stream Mapping (VSM) to identify value-added activities, along with Pareto Analysis and Problem Tree Analysis to determine the root causes of waste and delays. Results        : Analysis of the process flow and time achievements revealed inefficiencies, with a total duration of 26 hours, 1 minute, and 48 seconds. The proportion of Value-Added (VA) activities was recorded at 71%, while the remaining 29% were classified as Non-Value added (NVA), with the most significant waste occurring during the insurance review phase due to long waiting times and repetitive tasks. The results showed that Lean six sigma-based interventions were effective in improving efficiency, as indicated by a reduction in lead time during the post-intervention phase. Significant improvements were observed in Phases I and II, including the simplification of DPJP (attending physician) confirmation, acceleration of document verification, and reduction in waiting time during the insurance review process. Conclusion        : The implementation of Lean six sigma has a positive impact on optimizing the inpatient pre-registration process at Mayapada Hospital Tangerang