Introduction to PEDW

The Patient Episode Database for Wales (PEDW) is collated, validated and stored by ther NHS Wales Informatics Service on behalf of the Welsh Assembly Government and the NHS in Wales. It is a rich source of information about patients admitted to hospitals in Wales.

PEDW was implemented in April 1991 and contains all inpatient and day case activity (as well as regular attenders and maternity admissions) in NHS Wales. Definitions are provided in the NHS Wales Data Dictionary where detailed information about the dataset is available.

PEDW records contain patient demographics such as age, sex, place of residence and ethnicity, administrative details such as key dates, hospital, specialty and consultant, and clinical details such as diagnoses (ICD10 codes) and operative procedures (OPCS4 codes).