The development of national standard datasets can help to standardise how patient information is recorded and can facilitate easier sharing of information within and between health and social care services. Currently there is no standardised datasets to describe a diagnosis or adverse reaction that can be used for electronic documents such as referrals, discharge summaries and in a national patient summaries record. We are developing standardised datasets for diagnosis and adverse reactions and a technical specification using the international standard known as Health Level 7 Clinical Document Architecture which will facilitate the sharing of diagnosis and adverse reaction information.