OpenCodelists

Welcome to OpenCodelists, created by OpenSAFELY for creating and sharing codelists.

Anybody can also use this tool to create and share codelists. To get started, take a look at the documentation or watch the videos.

If you would like to publish codelists on behalf of an organisation, please get in touch.

Below, you'll find all the codelists that have been used in OpenSAFELY research to date.

All codelists


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Creatinine level SNOMED CT
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Published by Ardens
Creatinine tests SNOMED CT
Includes all codes related to plasma creatinine testing
Published by UK Renal Registry
Creatinine tests (level) SNOMED CT
Subset of https://www.opencodelists.org/codelist/ukrr/creatinine-tests/57f94ea6/, where all codes with attached numeric values in TPP are selected
Published by UK Renal Registry
Crohn ICD10 ICD-10
Crohn SNOMED SNOMED CT
Crohn disease SNOMED codes
Crohn's Disease CTV3
Published by OpenSAFELY
Crohn's disease exacerbations SNOMED SNOMED CT
Crohns disease codes SNOMED CT
Taken from the `CROHNS_COD` refset published by NHSD. Contains public sector information licensed under the UK Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).
Cryoglobulinaemic vasculitis codes SNOMED CT
Taken from the `CRYOGLOBVASC_COD` refset published by NHSD. Contains public sector information licensed under the UK Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).
Current Asthma CTV3
Codes indicating current, adult asthma.
Published by OpenSAFELY
Current COPD CTV3
Codelist indicating current COPD.
Published by OpenSAFELY
Current carer codes SNOMED CT
Taken from the `ISACARER_COD` refset published by NHSD. Contains public sector information licensed under the UK Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).
Current smoker SNOMED CT
Taken from the LSMOK_COD refset published by NHSD. Contains public sector information licensed under the UK Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).

Original codelist here: https://www.opencodelists.org/codelist/nhsd-primary-care-domain-refsets/lsmok_cod/20250627/.
Published by REDUCEHF
Cyclophosphamide systemic medication codes dm+d
Taken from the `CYCLOPHOSPHDRUG_COD` NHS drug refset. Contains public sector information licensed under the UK Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/).
Published by NHS Drug Refsets
Cystic Fibrosis CTV3
Codes indicating a diagnosis of cystic fibrosis or associated diseases such as primary ciliary dyskinesia
Published by OpenSAFELY