Globally, the cumulative incidence of long COVID by the end of 2023 is estimated at about 400 Million, according to an August 2024 report published in Nature Medicine. About 16% of adults in California reported ever experiencing long COVID as of July 2024 based on estimates from the U.S. Census Bureau’s Household Pulse Survey. About 30% of California adults who ever had long COVID reported activity limitations from long COVID in the U.S. Census Bureau’s Household Pulse Survey.
2 Million U.S. adults were out of work because of long COVID in 2022 according to the Brookings Institution estimates. The economic cost of long COVID in the U.S. is estimated to be $3.7 Trillion, including lost quality of life, lost earnings and increased spending on healthcare, according to David M. Cutler of Harvard University.
Prior studies, including two published by the WCIRB, estimated the prevalence of long COVID in workers’ compensation systems. However, information on the long-term impacts of COVID-19 on disability and system costs were limited due to data availability. And this week the WCIRB announced the publication of its new study “Long COVID in the California Workers’ Compensation System – 2024 Update.”
For the purpose of the study, long COVID claims in the workers’ compensation system are defined as COVID-19 claims involving medical treatment for at least one long COVID symptom during the post-acute care period – same as the definition of long COVID claims in prior WCIRB studies on long COVID.
Here are a few of the key findings of the new WCIRB 2024 Update Study:
– – Overall, more than 1 out of 7, or 15%, of COVID-19 claims with medical payments involved treatment for long COVID symptoms over a 30-month post-acute care period. Among all COVID-19 claims, only 5% were identified as involving long COVID due to the low prevalence among indemnity-only claims (0.3%), which represented over 40% of COVID-19 claims. Our estimates are consistent with published research using workers’ compensation data.
– – The prevalence of long COVID differs by clinical severity of acute COVID-19, with 13% among mild claims and over 40% among severe and critical claims that involved hospitalization. Therefore, COVID-19 claims that involved hospitalization for acute infection have a higher risk of long COVID than mild claims, consistent with published research and our previous research on long COVID.
– – Since most COVID-19 claims involved mild initial infections, these constitute more than 80% of long COVID claims identified.
– – The share of mild COVID-19 claims that involved treatment for long COVID symptoms decreased from 13% in the first quarter to 1% by the last quarter of the 30-month post-acute care period.
– – The most common long COVID symptoms treated in the workers’ compensation system are respiratory-related issues, such as shortness of breath, cough and chest pain. These symptoms were treated in over half of long COVID claims with a mild initial infection and three-quarters of long COVID claims involving hospitalization.
– – Overall, long COVID claims involve a wide range of symptoms affecting multiple body systems. Workers initially hospitalized for the acute infection were more likely to have multiple long COVID symptoms and symptoms in multiple body systems.
– – The leading risk factors for long COVID among patients with a mild initial infection include hypertension and use of corticosteroids, while diabetes and obesity increase risks for developing long COVID among hospital patients. Given that the comorbidity status for each patient was identified based on treatment for comorbidity in the two years prior to the pandemic, it may not capture comorbidities that were not treated within this time frame.
– – Overall, about 90% of long COVID claims involved disability benefits (either temporary or permanent), compared to about 55% among other COVID-19 claims without any treatment for long COVID symptoms. The pattern has been consistent over time.
– – The slow closure rate among long COVID claims involving PD benefits is a key underlying driver for the higher incurred indemnity losses and higher incurred medical losses on these claims.
These are just a few of the highlights. The full report is available in the Research Studies and Reports section of the WCIRB website at the following link Long COVID in the California Workers’ Compensation System – 2024 Update