Russia's Federal Statistics Rosstat said Friday that 44,265 people died of coronavirus in the country in September—nearly double the official government figure.
This would bring the agency's tally of COVID-19 deaths in Russia to nearly 450,000, the highest toll in Europe.
Russian authorities have been accused of downplaying the effects of the COVID-19 pandemic in the country and Rosstat's figure—released late Friday—painted a far darker picture than official figures suggest.
The number still fell short of Russia's monthly record of over 50,000 COVID fatalities in July, according to Rosstat.
An official government tally said Russia saw 24,031 deaths in September.
Rosstat, however, publishes figures under a broader definition for deaths linked to the virus.
Russia is the country hardest-hit in Europe by the pandemic, with authorities struggling to counter widespread anti-vaccine sentiment.
Despite pleas from President Vladimir Putin and the wide availability home-grown Sputnik V jab, only 32 percent of Russians are fully vaccinated.
Moscow shut down non-essential services for 11 days on Thursday as the country battles a record-breaking virus surge, driven by the low vaccination rates.
Russia recorded 1,163 COVID deaths on Friday.
Putin has ordered a nationwide paid week off starting Saturday in an effort to curb the spread of the virus.
© 2021 AFP