A critical component for nurses to provide safe and quality care with strong patient outcomes is clinical judgment. This study aimed to identify the difference in the clinical judgment score in newly graduated nurses by implementing Tanner's Clinical Judgment Model. This study followed an experimental design with a pretest-posttest and involved thirty-two newly graduated nurses from three private hospitals in Indonesia. The intervention group had a scheduled post-conference with their preceptors using Tanner's Clinical Judgment Model's guidelines with high-level, open-ended questions for two consecutive weeks. Independent samples t-test was used to compare pre-and post-test scores utilizing the valid and reliable Indonesia version of the Lasater Clinical Judgment Rubric. There was no significant difference between the pre-test results of the intervention and control groups, with a significance value of 0.647. The results indicated a significant difference in the mean clinical judgment scores between the intervention and control groups after two weeks of intervention, where the intervention group's scores were higher than the control group's with a significance value of <0.001 with a mean difference of 6.75 and CI of 95 % (4.18–9.31). Tanner's Clinical Judgment Model showed a significant impact in increasing clinical judgment scores. The Indonesia version of the Lasater Clinical Judgment Rubric is a valuable tool for assessing and evaluating the development of clinical judgment and provides detailed targeted areas needing improvement. Preceptors and nursing leaders in the clinical setting should continue to use this model and tools to assist newly graduated nurses in developing clinical judgment skills during their transition period.