<p><em>Diabetes Mellitus (DM) is a chronic disease whose treatment takes a long time. DM has a bad impact on health because of serious complications, both microvascular and macrovascular. Epidemiologically, it is estimated that in 2030 the prevalence of DM in Indonesia will reach 21.3 million people. Almost 50% of patients with type 2 DM are patients aged 65 years and over. DM in the elderly is metabolically different from DM in other ages, so a different therapeutic approach is needed in this group. This is because the elderly have experienced physical and mental decline which results in a decrease in quality of life and a decrease in understanding the command to use the medicine. The CBIA (Community Based Intensive Approach) method which synergizes between nutrition</em><em>ist</em><em> and pharmacist is applied to increase knowledge of blood sugar levels and their control in elderly patients suffering from diabetes. This research is a quantitative pre-post-test design study, with a control design. Respondents were taken from 2 health centers in Bantul by purposive sampling method, and 60 elderly respondents were obtained who fit the inclusion criteria. The level of knowledge of elderly patients on blood sugar control is very important to support the achievement of a good quality of life for elderly DM patients. The results of measuring the level of knowledge after the intervention in the form of pharmaceutical and nutritional care together with the CBIA method experienced a significant increase compared to the control group. The level of knowledge of respondents before the intervention was given there were 4 respondents with low knowledge, 26 respondents with moderate knowledge, 30 respondents with high knowledge. It has increased to 58 with high knowledge, and 2 with low knowledge. This shows the effect of providing CBIA interventions that synergize between nutritionists and pharmacists in increasing elderly patients' knowledge of DM</em><em>.</em></p>