This research aimed at improving students' conceptual understanding of the excretory system through index card match learning model (ICMLM) integrated with the flipped classroom. This study conducted a pre-experimental with One Group Pre-test-Post-test Design involving 16 students of Junior High School Muhammadiyah 7 Gresik grade VIII within a-twice meeting during limited face-to-face learning. The instruments consisted of pre-test and post-test, learning observation sheets, and questionnaires for student responses. Data collection used test and questionnaire method. Cognitive data analysis of concept understanding using t-test and N-Gain. The t-test result obtained a score of 0.000. Besides, the N-Gain test revealed an average score of 0.75, characterized in the high category. This test showed that students' understanding of concepts in detail is increased, namely, 7 students in the medium category and 9 students in the high category. Student responses after treatment were considered very good, with a percentage of 86.45%.