The prevalence of information systems in healthcare enables the use of health data for purposes related to data-driven decision-making. The technology "promise" is to make healthcare organizations more efficient. Despite the increased interest in health data in general and patient generated data in particular, there is a need for additional research on how data support health practices. This paper therefore conducts a case study of a nurse-led clinic for cancer rehabilitation to examine how a data-supported practice achieves value. By breaking down the data-gathering process, with a focus on value, we show how value is co-created by a range of different actors, including patients, nurses and researchers. In this case, the value co-creation consist of two parallel processes. A knowledge process revolving around a research practice with the aim to produce new knowledge. It is a process which provide a foundation and structure for the clinical practice. The interactional process work in parallel and describes the interaction with and about data between the different actors and how the interaction is an essential resource to achieve data value.