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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atrial_fibrilation Read V2
Published by QMUL Multimorbidity
blindness Read V2
Published by QMUL Multimorbidity
bronchiectasis Read V2
Published by QMUL Multimorbidity
cancer immunosuppression SNOMED CT
Codelist for cancer immunosuppression which may be associated with repeat (prophylactic) antibiotic prescribing in primary care. Antibiotic prophylaxis is recommended for patients with or at risk of serious neutropenia (e.g. following hematopoietic stem-cell transplantation or treatment with myeloablative conditioning regimens [total body irradiation or chemotherapy])
Published by UKHSA
chronic inflammatory demyelinating polyneuropathy (CIDP) CTV3
CTV3 codelist for chronic inflammatory demyelinating polyneuropathy (no corresponding ICD-10 codes found)
Published by OpenSAFELY
chronic kidney disease stage 4 SNOMED CT
This codelist aims to specifically include all individuals with CKD stage 4
chronic kidney disease stage 5 not receiving kidney replacement therapy SNOMED CT
This codelist aims to specifically include all individuals with CKD stage 5. This codelist differs from other published kidney failure codelists as it excludes all codes relating to a person being in receipt of dialysis or having had a kidney transplant.
chronic_kidney_disease SNOMED CT
SNOMED codelist for the `chronic_kidney_disease` group in the QCovid® to develop the
COVID-19 Population Risk Assessment.
Published by QCovid
clotrimazole dm+d
Clotrimazole

Updated July 14,2026
cognitive-impairment SNOMED CT
This codelists identifies individuals with probable cognitive impairment for dementia/ shingles vaccine study.
The purpose is to identify those who are on "dementia trajectory" to stratify the effect of the vaccine on dementia incidence.
Published by OpenSAFELY
colorectal cancer ICD10 ICD-10
colorectal cancer ctv3 CTV3
colorectal cancer snomed SNOMED CT
declined 3rd COVID vaccination SNOMED CT
Taken from the `COV3DECL_COD` fields in SARS-CoV2 (COVID-19) Vaccine Uptake Reporting Codes v.1.5.3
declined course/dose COVID vaccination SNOMED CT
Taken from the `COVDECL_COD` fields in SARS-CoV2 (COVID-19) Vaccine Uptake Reporting Codes v.1.5.3