Did hospitals reclassify influenza and other respiratory illness deaths as COVID-19 during 2020-2022, and does all-cause mortality data support or contradict that reclassification story?

The short version: the evidence shows that cause-of-death classification was often inaccurate during the pandemic, and all-cause mortality data is the more reliable measure.

A 2025 study from Athens found that 45.3% of in-hospital deaths coded as COVID-19 during the Omicron surge were not actually caused by the virus [1]. The patients died of bacterial sepsis, aspiration pneumonia, stroke, heart failure, and cancer, but their death certificates listed COVID-19. This is not a conspiracy theory. It is a published finding from a major hospital system.

This kind of misclassification is well documented outside of COVID-19. A 1980 autopsy study found that cause-of-death certificates were wrong in about 30% of cases compared to what an autopsy revealed [4]. A 2023 Dutch study found that heart failure was over-reported as the underlying cause of death by about 45% due to reporting errors and automated coding bias [2]. The system has always been sloppy. The pandemic just gave it a high-stakes stress test.

All-cause mortality is the gold standard for exactly this reason. It does not depend on what a doctor wrote in a box. It counts every death, regardless of the cause assigned. The Spanish life expectancy data shows that 2020 saw a drop of 1.25 years, driven almost entirely by infectious diseases [5]. By 2023, life expectancy had partially recovered but remained 0.24 years below the pre-pandemic trend. That gap is real, and it is not explained by reclassification of flu deaths. The flu essentially disappeared during the first two years of the pandemic because of masking and lockdowns [6]. There were not enough flu deaths to reclassify.

The stroke mortality data tells a similar story. Ischemic stroke deaths rose from about 30,700 in 2019 to 49,600 in 2024, a 61% increase [3]. Only about 20% of the excess stroke deaths between 2020 and 2024 had COVID-19 listed anywhere on the death certificate. The rest were coded as pure stroke. That means the rise in stroke deaths is not an artifact of reclassification. It is a real increase in cardiovascular mortality that coincided with the pandemic and its aftermath.

My call: the reclassification story is real in individual cases, especially in hospitals that coded any death with a positive PCR test as a COVID-19 death, but it does not explain the massive all-cause mortality excess. The all-cause data confirms that something genuinely deadly happened, and it was not just influenza rebranded.

Confidence: high that reclassification occurred in a significant minority of cases; moderate that it does not account for the bulk of excess mortality.