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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Kawasaki disease codes SNOMED CT
Taken from the `KAWASAKI_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/).
Keppra tablets BNF
Used by the following [OpenPrescribing](https://openprescribing.net) measures:

* [Levetiracetam prescribed as Keppra](https://openprescribing.net/measure/keppra/)
Published by OpenPrescribing
Ketotifen dm+d
Codes that can records as treatment of allergic conjoctivitis

Updated July 20,2026
Kidney transplant CTV3
Codes indicating kidney transplant (recipient)
Published by OpenSAFELY
Knee replacement - Other prosthetic replacement of other bone (Clean) (W54) OPCS-4
Procedure category: Knee replacement - Replacement of all or part of knee joint (with or without patella resurfacing), including revision of a previous replacement. Patella resurfacing and patella replacement are not included in the surveillance. The minimum wound class for knee replacement surgery is clean.

Procedure subcategory: Other prosthetic replacement of other bone (Clean) (W54)
Knee replacement - Other reconstruction of joint (Clean) Exclude: Some similar operations for correction of congenital deformity (X19-X27) (W58) OPCS-4
Procedure category: Knee replacement - Replacement of all or part of knee joint (with or without patella resurfacing), including revision of a previous replacement. Patella resurfacing and patella replacement are not included in the surveillance. The minimum wound class for knee replacement surgery is clean.

Procedure subcategory: Other reconstruction of joint (Clean) Exclude: Some similar operations for correction of congenital deformity (X19-X27) (W58)
Knee replacement - Other total prosthetic replacement of knee joint (Clean) (W42) OPCS-4
Procedure category: Knee replacement - Replacement of all or part of knee joint (with or without patella resurfacing), including revision of a previous replacement. Patella resurfacing and patella replacement are not included in the surveillance. The minimum wound class for knee replacement surgery is clean.

Procedure subcategory: Other total prosthetic replacement of knee joint (Clean) (W42)
Knee replacement - Prosthetic replacement of articulation of other bone not using cement (Clean) (W53) OPCS-4
Procedure category: Knee replacement - Replacement of all or part of knee joint (with or without patella resurfacing), including revision of a previous replacement. Patella resurfacing and patella replacement are not included in the surveillance. The minimum wound class for knee replacement surgery is clean.

Procedure subcategory: Prosthetic replacement of articulation of other bone not using cement (Clean) (W53)
Knee replacement - Prosthetic replacement of articulation of other bone using cement (Clean) (W52) OPCS-4
Procedure category: Knee replacement - Replacement of all or part of knee joint (with or without patella resurfacing), including revision of a previous replacement. Patella resurfacing and patella replacement are not included in the surveillance. The minimum wound class for knee replacement surgery is clean.

Procedure subcategory: Prosthetic replacement of articulation of other bone using cement (Clean) (W52)
Knee replacement - Total prosthetic replacement of knee joint not using cement (Clean) (W41) OPCS-4
Procedure category: Knee replacement - Replacement of all or part of knee joint (with or without patella resurfacing), including revision of a previous replacement. Patella resurfacing and patella replacement are not included in the surveillance. The minimum wound class for knee replacement surgery is clean.

Procedure subcategory: Total prosthetic replacement of knee joint not using cement (Clean) (W41)
Knee replacement - Total prosthetic replacement of knee joint using cement (Clean) (W40) OPCS-4
Procedure category: Knee replacement - Replacement of all or part of knee joint (with or without patella resurfacing), including revision of a previous replacement. Patella resurfacing and patella replacement are not included in the surveillance. The minimum wound class for knee replacement surgery is clean.

Procedure subcategory: Total prosthetic replacement of knee joint using cement (Clean) (W40)
Knee replacement - Unicompartmental (partial) knee replacements (W42_1) OPCS-4
Procedure category: Knee replacement - Replacement of all or part of knee joint (with or without patella resurfacing), including revision of a previous replacement. Patella resurfacing and patella replacement are not included in the surveillance. The minimum wound class for knee replacement surgery is clean.

Procedure subcategory: Unicompartmental (partial) knee replacements (W42_1)
LABA + ICS Combination Inhaler dm+d
A list of combination inhalers including a long acting beta agonist (LABA) and an inhaled corticosteroid (ICS) preparations at VMP and AMP from the [NHS Dictionary of Medicines and Devices](https://ebmdatalab.net/what-is-the-dmd-the-nhs-dictionary-of-medicines-and-devices/).
Published by OpenSAFELY
LABA + LAMA + ICS Combination Inhaler dm+d
A list of combination inhalers including a long acting beta agonist (LABA) and long acting antimuscarininc (LAMA) and inhaled corticosteroids (ICS) preparations at VMP and AMP from the [NHS Dictionary of Medicines and Devices](https://ebmdatalab.net/what-is-the-dmd-the-nhs-dictionary-of-medicines-and-devices/).
Published by OpenSAFELY
LABA + LAMA Combination Inhaler dm+d
A list of combination inhalers including a long acting beta agonist (LABA) and long acting antimuscarininc (LAMA) preparations at VMP and AMP from the [NHS Dictionary of Medicines and Devices](https://ebmdatalab.net/what-is-the-dmd-the-nhs-dictionary-of-medicines-and-devices/).
Published by OpenSAFELY