What does interoperability refer to in the context of health information systems?

Interoperability in the context of health information systems is fundamentally about the ability of different systems to communicate and exchange information seamlessly. This involves not just the exchange of data but also the ability for that data to be understood and utilized effectively by each system involved.

When health information systems are interoperable, they can share patient data across various platforms, whether those systems belong to different healthcare organizations, departments, or even different countries. This capability is essential for coordinated care, improving patient outcomes, and ensuring that healthcare providers have access to complete and accurate patient information regardless of where it is stored.

The other options, while relevant to aspects of health informatics, do not capture the essence of interoperability as accurately as the correct choice. Secure storage relates more to data privacy and security, aggregation focuses on compiling data within a single system rather than the interaction between systems, and standardized codes pertain to uniform terminology rather than the functional exchange of data. Thus, option B is the most comprehensive and relevant answer regarding what interoperability means in health information systems.