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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Body mass index (BMI) codes >= 30 without an associated BMI value SNOMED CT
Taken from the `BMI30_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/).
Body mass index (BMI) codes >= 35 without an associated BMI value SNOMED CT
Taken from the `BMI35_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/).
Body mass index (BMI) codes >= 40 without an associated BMI value SNOMED CT
Taken from the `LBMI40_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/).
Body mass index (BMI) codes with an associated BMI value SNOMED CT
Taken from the `BMIVAL_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/).
Body mass index (BMI) healthy codes SNOMED CT
Taken from the `BMIHEALTHY_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/).
Body mass index (BMI) obese codes SNOMED CT
Taken from the `BMIOBESE_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/).
Body mass index (BMI) overweight codes SNOMED CT
Taken from the `BMIOVER_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/).
Body mass index (BMI) underweight codes SNOMED CT
Taken from the `BMIUNDER_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/).
Body mass index (numeric value) SNOMED CT
Taken from the BMIVAL_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/bmival_cod/20250627/
Published by REDUCEHF
Bone Density Scan SNOMED CT
Codes which relate to the arrangement, completion, or result of a bone density scan.
Published by OpenSAFELY
Bone Marrow Transplant CTV3
Codes indicating a bone marrow transplant has been carried out
Published by OpenSAFELY
Bone Marrow Transplant (SNOMED) SNOMED CT
Automatically-generated equivalent of [Bone Marrow Transplant](/codelist/opensafely/bone-marrow-transplant/)
Published by OpenSAFELY
Bone sparing agent drug codes dm+d
Taken from the `BSADRUG_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
Bone sparing therapy codes SNOMED CT
Taken from the `BSA_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/).
Booster DTaP/IPV vaccination codes SNOMED CT
Taken from the `DTAPIPVVACBOOST_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/).