AHRU
Epidemiological database

This website contains information on episodes of hospital care in England from April 1998 to the present day.
Using HES (Hospital Episode Statistics) data, the website provides information on hospital stays and the clinical conditions and procedures associated with them.

To get started, enter a specific ICD-10 or OPCS-4 code, or part thereof, or a search term, into the search box below:



The website contains the following areas:

Counts
Spells and people by diagnosis or operation from HES data, comparing counts given by analysing Continuous Inpatient Spells and individual people.

Studies
A more in-depth focus on specific conditions or procedures.

Case-mix: clinical combinations
Diagnoses and/or operations that occur on the same Finished Consultant Episode record.

Case-mix: position of diagnoses on records
For each diagnosis, shows the place on the record where the condition is coded - whether, for example, in the main position or elsewhere, on the first, the last, or an intermediate FCE.

Case-mix: position of operations on records
For each operation shows the place on the record where it is coded - whether, for example, in the main position or elsewhere, on the first, the last, or an intermediate FCE.

Admissions and mortality atlases
Historical documents showing geographical analyses of hospital admissions and mortality across the country.

Mortality trends
Historical documents showing trends in mortality in England by disease.



Big Data Institute

Unit of Health Care Epidemiology


The content of this website was designed and produced by Michael Goldacre, Nick Hall, Mattasser Nazir, Leicester Gill, Myfanwy Griffith, and Glenys Bettley.

The work was funded at various times by the Department of Health, the NHS National Co-ordinating Centre for Research Capacity Development, the Department of Health's National Institute for Health Research, the Department of Health's National Centre for Health Outcomes Development, and the Nuffield Department of Population Health.

© 2025 Nuffield Department of Population Health, University of Oxford, Old Road Campus, Headington, Oxford, OX3 7LF
Tel: +44 (0)1865 289377/8