Introduction: In the Netherlands, bundled payments were introduced gradually after 2010 to stimulate the integration of primary care services for different chronic conditions including diabetes, vascular risk management, COPD, depression, asthma, as well as for the elderly. The expectation for this reform was that integrated care could control healthcare expenditure by improving efficiency in primary care and promoting prevention. However, little is known whether this expectation is fulfilled. The aim of this study was to investigate the association between integrated care and healthcare costs in the Netherlands.Methods: Claims data from 2008 to 2017 from all Dutch health insurers was used. Enrolment of individuals in an integrated care programme was identified based on payment codes for integrated care services. Individuals entered integerated care at different points during this period. The control cohort consisted of individuals who were not enrolled in any integrated care programme and who were matched with individuals in the intervention cohort based on gender, age, socio-economic status, and type and number of chronic conditions. Cost were available on spending from basic health insurance in multiple categories e.g. GP, medication, and medical-specialist per person per half year from 2008 to 2015. Descriptive statistics and a preliminary analysis with an ordinary least squares were conducted.Preliminary Results: The intervention group consists of 2.8 million and the control group of 1 million persons. In 2008, both were of similar age median 70 and gender female 51%, and had similair costs €1600, semi-annual. More people in the intervention group used medical care, for example, for medication 87% vs. 77% and secondary care 64% vs. 53%. The largest integrated care programme in 2015 was for diabetes 675,000 people. From the people who started integrated care in 2008 over 55% stayed in the full 8 years. Patients with more than one chronic condition had higher costs €3640 vs €1236.For indivduals who had been ...