The prevalence of diabetes mellitus worldwide continues to increase, it is predicted that in 2030 people with diabetes mellitus will reach 550 million people, this is equivalent to about three new cases every 10 seconds, or nearly 10 million year. The epidemic is not evenly distributed around the world. While the world-wide prevalence of diabetes is 3–4%, several countries and regions experience a prevalence rate of diabetes of well over 10%. This research method uses a qualitative descriptive method. The total number of samples in this study are 7 people consisting of 6 key informants and 1 additional informant. The method of data collection in this study uses the interview method. The results of the study found that the implementation of the referral system policy went as expected, it can be seen in terms of aspects of communication that are going well, sufficient resources, good disposition and a clear bureaucratic structure. However, there are some of things that still need to be improved, such as outreach related to the flow of the referral system for patients with diabetes mellitus. Based on these results, it can be concluded that the policy implementation of the referral system at the Kassi Health Center has been going well and as expected. The community is expected to always follow the latest information related to the referral system, especially people with diabetes mellitus so that the current referral flow is still implemented. This information can be obtained through applicable guidelines, the internet or direct discussion.