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Abstract

Background

The surveillance of persons hospitalised with COVID-19 has been essential to ensure timely and appropriate public health response. Ideally, surveillance systems should distinguish persons hospitalised with COVID-19 from those hospitalised due to COVID-19.

Aim

We compared data in two national electronic health registries in Norway to critically appraise and inform the further development of the surveillance of persons hospitalised with COVID-19.

Method

We included hospitalised COVID-19 patients registered in the Norwegian Patient Registry (NPR) or the Norwegian Pandemic Registry (NoPaR) with admission dates between 17 February 2020 and 1 May 2022. We linked patients, identified overlapping hospitalisation periods and described the overlap between the registries. We described the prevalence of International Classification of Diseases (ICD-10) diagnosis codes and their combinations by main cause of admission (clinically assessed as COVID-19 or other), age and time.

Results

In the study period, 19,486 admissions with laboratory-confirmed COVID-19 were registered in NoPaR and 21,035 with the corresponding ICD-10 code U07.1 in NPR. Up to late 2021, there was a 90–100% overlap between the registries, which thereafter decreased to < 75%. The prevalence of ICD-10 codes varied by reported main cause, age and time.

Conclusion

Changes in patient cohorts, virus characteristics and the management of COVID-19 patients from late 2021 impacted the registration of patients and coding practices in the registries. Using ICD-10 codes for the surveillance of persons hospitalised due to COVID-19 requires age- and time-specific definitions and ongoing validation to consider temporal changes in patient cohorts and virus characteristics.

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/content/10.2807/1560-7917.ES.2023.28.33.2200888
2023-08-17
2024-04-27
http://instance.metastore.ingenta.com/content/10.2807/1560-7917.ES.2023.28.33.2200888
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A comparison of two registry-based systems for the surveillance of persons hospitalised with COVID-19 in Norway, February 2020 to May 2022
<p class="citation"> <span>Citation style for this article:</span> <span class="meta-value authors"> <a href="/search?value1=Robert+Whittaker&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Whittaker Robert</a>, <a href="/search?value1=Salla+Toikkanen&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Toikkanen Salla</a>, <a href="/search?value1=Katharine+Dean&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Dean Katharine</a>, <a href="/search?value1=Trude+Marie+Lyngstad&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Lyngstad Trude Marie</a>, <a href="/search?value1=Eirik+Alnes+Buanes&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Buanes Eirik Alnes</a>, <a href="/search?value1=Hilde+Kl%C3%B8vstad&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Kløvstad Hilde</a>, <a href="/search?value1=Trine+Hessevik+Paulsen&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Paulsen Trine Hessevik</a>, <a href="/search?value1=Elina+Sepp%C3%A4l%C3%A4&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Seppälä Elina</a></span>. A comparison of two registry-based systems for the surveillance of persons hospitalised with COVID-19 in Norway, February 2020 to May 2022. <a href="/content/ecdc">Euro Surveill.</a> 2023;28(33):pii=2200888. <a href="https://doi.org/10.2807/1560-7917.ES.2023.28.33.2200888" title="doi link" target="_blank">https://doi.org/10.2807/1560-7917.ES.2023.28.33.2200888</a> <span class="ES_Article_citation"> <span class="generated">Received</span>: 16 Nov 2022;&nbsp;&nbsp; <span class="generated">Accepted</span>: 05 Apr 2023 </span> </p>
/content/10.2807/1560-7917.ES.2023.28.33.2200888
/content/10.2807/1560-7917.ES.2023.28.33.2200888
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