The association between coding for chronic kidney disease and kidney replacement therapy incidence at CCG-level in England: an ecological study.

Christoph Heinrich Lindemann ORCID logo ; James Medcalf ; James Fv Hollinshead ; Dorothea Nitsch ORCID logo ; (2025) The association between coding for chronic kidney disease and kidney replacement therapy incidence at CCG-level in England: an ecological study. BJGP Open. BJGPO.2024.0171-BJGPO.2024.0171. ISSN 2398-3795 DOI: 10.3399/BJGPO.2024.0171 (In Press)
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BACKGROUND: With ageing of the population both prevalence of chronic kidney disease (CKD) and incidence of kidney replacement therapy (KRT) are rising. Existing research suggests that Read-coding for CKD in those affected is associated with better implementation of recommended care and fewer hospitalisations for heart failure. AIM: To investigate whether coding for CKD is associated with regional KRT incidence in England. DESIGN & SETTING: This is an ecological study using the clinical commissioning groups (CCG) in England as geographical units. METHOD: KRT incidence rates were calculated using UK Renal Registry (UKRR) data from 01/2019 to 12/2021. Data on the percentage of uncoded CKD patients (PUCP) who had laboratory evidence of CKD but lacked a diagnostic code were obtained from the CVDPREVENT Audit, a national audit that extracts routinely held general practitioner data. Data on confounders and acute kidney injury (AKI) mortality as a marker for population frailty were obtained from CVDPREVENT and the UKRR, respectively. Poisson models assessed the association between PUCP and KRT incidence. RESULTS: After adjusting, the PUCP was non-linearly associated with KRT incidence, with the CCGs in the lowest PUCP quintile having a lower KRT incidence than the others. There was evidence that this association was more pronounced in CCGs with high AKI mortality compared to CCGs with low AKI mortality. CONCLUSION: At the geographical level in England, the data suggests that the prevalence of not having formally diagnosed CKD is non-linearly associated with a higher KRT incidence rate, especially in areas with a high AKI mortality.

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