> For the complete documentation index, see [llms.txt](https://ourfuturehealth.gitbook.io/our-future-health/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ourfuturehealth.gitbook.io/our-future-health/data-types/linked-health-records-data.md).

# Linked health records data

Linked health records data are provided to Our Future Health through a data sharing agreement with NHS England (NHSE). NHSE routinely provides data products for research through their Data Access Request Services, provided applications have gone through a strict review and approvals process. These data products use data that has been provided by patients and collected by the NHS as part of their care and support. The data are collated, maintained and quality assured by the National Disease Registration Service, which is part of NHS England

The table below provides a brief overview of all the linked datasets available for the Our Future Health participant cohort. See the [Linked dataset descriptions](/our-future-health/data-types/linked-health-records-data/linked-dataset-descriptions.md) page for more detailed descriptions. Refer to the [release page](/our-future-health/data-releases/current-data-release.md) for information on date ranges for finalised and provisional data. See the [section on provisional data](/our-future-health/data-releases/2026-data-releases/release-14.md#hes-provisional-data-may-change-between-releases) for more information on how to identify provisional records in the linked data.

Refer to the [Data content and processing page](/our-future-health/data-types/linked-health-records-data/linked-data-content-and-processing.md) for details on pipeline processing of the data prior to release and the [linkage page](/our-future-health/data-types/linked-health-records-data/the-linkage-process.md) for information on how participant data is linked to their health records. For more information on data field descriptions and medical ontology codes, refer to the data dictionary and coding file in the [Data and cohort page](https://research.ourfuturehealth.org.uk/data-and-cohort/).

<table><thead><tr><th width="151.11328125">Dataset</th><th width="157">Entity name in TRE</th><th width="138.1328125">Description*</th><th width="122.4453125">Provisional data available (Yes/No)</th><th width="107">Number of fields available</th><th>Medical Ontology Codes</th></tr></thead><tbody><tr><td><strong>Primary care</strong></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td><ul><li>Dispensed Medicines in Primary care</li></ul></td><td><code>nhse_eng_primcare_meds</code></td><td>Medicines dispensed in primary care settings in England from 1 April 2018</td><td>No</td><td>32</td><td><p>dm+d </p><p>(Dictionary of Medicines and Device) </p><p>+ BNF </p><p>(British National Formulary)</p></td></tr><tr><td><strong>Secondary care</strong></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td><ul><li>HES Accident &#x26; Emergency</li></ul></td><td><code>nhse_eng_ed</code></td><td>Attendances of major A&#x26;E departments in England from 1 April 2007 until 31st March 2020</td><td>No</td><td>91</td><td><p>A&#x26;E codes </p><p>ICD-10 </p><p>READ codes</p></td></tr><tr><td><ul><li>HES Emergency Care Dataset </li></ul></td><td><code>nhse_eng_ecds</code></td><td>Attendances of major A&#x26;E departments in England on and after 1st April 2020</td><td>Yes</td><td>162</td><td>SNOMED‑CT</td></tr><tr><td><ul><li>HES Admitted Patient Care</li></ul></td><td><code>nhse_eng_inpat</code></td><td>Episodes of in-patient care in hospitals in England registered from 1 April 1997 </td><td>Yes</td><td>108</td><td><p>ICD‑10 </p><p>OPCS‑4</p></td></tr><tr><td><ul><li>HES Outpatient</li></ul></td><td><code>nhse_eng_outpat</code></td><td>Outpatient appointments in hospitals in England from 1 April 2003</td><td>Yes</td><td>55</td><td><p>ICD-10 </p><p>OPCS‑4</p></td></tr><tr><td><strong>Cancer</strong></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td><ul><li>NDRS Cancer Registry Patient Tumour</li></ul></td><td><code>nhse_eng_canreg_pattumour</code></td><td>Cancer treatment data at tumour-level from 1 January 1995</td><td>No</td><td>49</td><td><p>ICD-10</p><p>ICD-9</p><p>ICD-O</p></td></tr><tr><td><ul><li>NDRS Cancer Registry Cancer Treatment</li></ul></td><td><code>nhse_eng_canreg_treat</code></td><td>Cancer data by treatment event at given tumour from 1 January 1995</td><td>No</td><td>22</td><td><p>ICD-10</p><p>ICD-9</p><p>ICD-O</p></td></tr><tr><td><ul><li>NDRS Cancer Registry pre-1995</li></ul></td><td><code>nhse_eng_canreg_pre1995</code></td><td>Cancer registry data for tumours diagnosed 1 January 1985 to 31 December 1994</td><td>No</td><td>8</td><td><p>ICD-8 </p><p>ICD-9</p></td></tr><tr><td><ul><li>NDRS Cancer Pathways</li></ul></td><td><code>nhse_eng_canpat</code></td><td>Cancer pathways data from January 2013 in England</td><td>No</td><td>12</td><td><p>ICD-10</p><p>ICD-9</p><p>ICD-O</p></td></tr><tr><td><strong>Death registrations</strong></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td><ul><li>ONS Death Registration</li></ul></td><td><code>nhse_engwal_deaths</code></td><td>Death registration and mortality data for individuals that had a death certificate registered in England and Wales from 1 June 2022</td><td>Yes</td><td>20</td><td>ICD-10</td></tr><tr><td><strong>Derived datasets</strong></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td><ul><li>Linked Participants</li></ul></td><td><code>participant_nhs_linked</code></td><td>Participants successfully linked to an NHS number </td><td>No</td><td>2</td><td>N/A</td></tr></tbody></table>

\*The linked health records cover a defined time period. The start date reflects when data become available for participants, and the end date reflects the most recent point up to which records have been received, processed and made available to researchers in the TRE. For more information on data coverage windows, please refer to our [current data release page](/our-future-health/data-releases/current-data-release.md#id-2026-data-releases).


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