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 we have used in OpenSAFELY research to date.

All codelists

Sodium tests (numerical value) SNOMED CT

A SNOMED CT codelist for patients receiving monitoring of sodium levels, with a numerical value.

Published by OpenSAFELY
Solid Organ Transplantation CTV3

Codes indicating solid organ transplantion (receptient only) has been carried out

Published by OpenSAFELY
Solid Organ Transplantation (SNOMED) SNOMED CT

Automatically-generated equivalent of Solid Organ Transplantation

Published by OpenSAFELY
Spironolactone dm+d

This codelist contains spironolactone preparations.

Published by OpenSAFELY
Statin Medication dm+d

A list of statin preparations at VMP and AMP from the NHS Dictionary of Medicines and Devices.

Published by OpenSAFELY

Automatically-generated equivalent of Stroke

Published by OpenSAFELY
Stroke (deprecated) CTV3

DEPRECATED due to presence of Read 2 codes, and missing CTV3 codes, the corrected version is:

Codes indicating stroke (both haemorrhagic and ischaemic).

Published by OpenSAFELY
Stroke (updated) CTV3

An updated version of, which contained some stray unmapped Read 2 codes.

The original codelist had 49 Read 2 codes. These are replaced by 127 CTV3 codes.

Published by OpenSAFELY
Stroke Secondary Care ICD-10

Stroke ICD-10 codes.

Published by OpenSAFELY
Structured Medication Review - NHS England SNOMED CT

SNOMED code to support NHS England Structured Medication Review Service.

Published by OpenSAFELY
Sulfasalazine (oral) BNF
Published by OpenSAFELY
Sulfasalazine-oral (dmd) dm+d

Oral sulfasalazine preparation in dm+d

Published by OpenSAFELY
Surgery Emergency OPCS-4 codes WITHOUT complication codes OPCS-4

This is a list of all the emergency OPCS-4 codes (as defined by RCS priority groups 1a and 1b), excluding the complication OPCS-4 codes for amputations, dislocations, compartment syndrome and washouts

Published by OpenSAFELY
Surgery emergency and immediate procedure OPCS-4 codes OPCS-4

OPCS-4 codes indicating an emergency or immediate procedure. Can be used in addition to primary procedure code

Published by OpenSAFELY
Surgery for peripheral artery disease CTV3

DEFINITION: Surgery for peripheral artery disease

Variables: (1) a binary variable denoting the presence of one of the codes at any point in the patient record. (2) the earliest date of such a code.

Published by OpenSAFELY