Name that thing: What should I call a ‘person’ in a case management system?

Think of a system that manages details about people--a case management system tracking hospital patients, or a CRM tracking phone calls by customers, or an insurance provider's system that tracks care recipients, which include the insurance holder and their dependents. In the above system model, what do you call the 'person' to whom you are connecting your activities?

For example, one instance from above--the insurance provider. As the provider, you need to track a variety of people contextually--primary insurance plan holder and their dependents. One or more of those 'people' could be a patient in relation to health insurance. The database is modeled so that those various groups of 'people' are all the same thing to the system. I need a good word for that. Right now the system is using 'Person', which feels awkward to me...