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 we have used in OpenSAFELY research to date.

All codelists


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Systolic blood pressure QoF SNOMED CT

A SNOMED CT codelist containing codes relating to systolic blood pressure (SBP) measurement.

Published by OpenSAFELY
Temporary Immunosuppression CTV3

Codes indicating a diagnosis of a temporary immunosuppression.

Published by OpenSAFELY
Temporary Immunosuppression (SNOMED) SNOMED CT

Automatically-generated equivalent of Temporary Immunosuppression

Published by OpenSAFELY
Thiazide type diuretic medication dm+d

The codelist contains medicines that are thiazide diuretics from the "thiazides and related diuretics" section of BNF codes.

Published by OpenSAFELY
Third, fourth, fifth primary COVID vaccination dose SNOMED CT

Taken from the DOSE345_COD fields in SARS-CoV2 (COVID-19) Vaccine Uptake Reporting Codes v.1.5.3

Thyroid stimulating hormone (TSH) testing SNOMED CT

This codelist was developed to identify patients receiving a thyroid-stimulating hormone (TSH) test

Published by OpenSAFELY
Thyroid stimulating hormone (TSH) tests (numerical value) SNOMED CT

This codelist was developed to identify patients receiving a thyroid-stimulating hormone (TSH) test, with a numerical value.

Published by OpenSAFELY
Transient ischaemic attack CTV3

Codes that indicate incident or history of transient ischaemic attack. This codelist include definite and probable transient ischaemic attack. Future studies which require codes denoting definite transient ischaemic attack need to derive another codelist.

Published by OpenSAFELY
Transient ischaemic attack - secondary care ICD-10

This is a codelist of ICD-10 codes for TIA.

Published by OpenSAFELY
Transverse Myelitis CTV3

Codes that indicate an episode of transverse myelitis

Published by OpenSAFELY
Type 1 Diabetes CTV3

Codes explicitly indicating Type 1 Diabetes

Published by OpenSAFELY
Type 1 diabetes (secondary care) ICD-10

Codes explicity indicating Type 1 Diabetes (secondary care)

Published by OpenSAFELY
Type 2 Diabetes CTV3

Codes explicitly indicating Type 2 Diabetes

Published by OpenSAFELY
Ulcerative colitis CTV3
Published by OpenSAFELY
VTE classified codes CTV3

VTE codes classified into cvt, dvt, pe, hepatic, smv, unspecified and other.

Published by OpenSAFELY