Discriminator column displayed as a Hibernate object

Yes, perhaps, although this attitude will be read-only:

@Entity @Inheritence(...)
@DiscriminatorColumn(name = "DEPT_TYPE_ID")
public class Department {
    ...
    @ManyToOne
    @JoinColumn(name = "DEPT_TYPE_ID", insertable = false, updatable = false)
    private DepartmentType deptType;
    ...
}