A Community Health Information Network (CHIN) is a web-based net of computer systems which allows the electronic exchange of clinical, financial and administrative information among unaffiliated healthcare entities in order to improve the efficiency and delivery of healthcare in the community. It achieves this through a combination of services, products and technology.One field of application in which CHINs can be very effective is disease management; the aim of disease management is to align patient, provider and payer interests in order to enhance quality of care and cost savings. CHINs can be used to effectively and efficiently implement disease management programmes through linking disease management systems (i.e. computerised disease management programmes) with other information systems. The application of CHINs in the implementation of disease management programmes has many benefits including shared data, internal communication, external communication, value-added applications, bonding and marketing presence. However, there are also problems and pitfalls of an architectural and ‘emotional’ nature. Architectural problems relate to legacy system incompatibility, legacy functionality, external data representation, communications disparity, distributed governance, flexibility versus homogeneity, confidentiality, and size and scalability. Emotional problems include personal barriers, community and ethnic cultural issues, and suspicion between the various levels of care involved in an information exchange process.Many examples of operational CHINs can be found on the Internet. Although many challenges lie ahead for patients, healthcare providers and healthcare organisations in this field, these examples show that the use of CHINs will influence medical and healthcare practice in a positive way, especially in terms of disease management.