Summary Objective: To analyze the health care costs specifically related to cardiovascular diseases, which were spent by patients of a private healthcare provider in southern Brazil, after their diagnosis of cancer. Method: We developed an observational, cross-sectional, retrospective study, with a qualitative-quantitative strategy, through the activity of analytical internal audit of medical accounts. Results: 860 accounts from 2012 to 2015 were analyzed, 73% referred to female users, with average age of 62.38 years, and a total direct cost of BRL 241,103.72. There was prevalence of 37% of breast cancer, 15% of prostate cancer and 9% of colon cancer. In relation to the cardiovascular care, 44% were consultations, 44% were complementary exams, 10% were emergency care, and 3% were hospitalizations. Regarding the health care costs with cardiovascular services, higher costs were in hospitalizations (51%), followed by complementary exams (37%), consultations (8%) and emergency care (4%). Conclusion: The cancer survivors commonly use health care in other specialties such as cardiology, and the main cost refers to hospitalization. It is recommended to invest in prevention (consultation and complementary exam) as well as in programs of chronic disease management to reduce costs and improve the quality of health care.