More than 2,200 Indonesians have died with acute symptoms of COVID-19 but were not recorded as victims of the disease, a Reuters review of data from 16 of the country's 34 provinces showed.
Three medical experts said the figures indicated the national death toll was likely to be much higher than the official figure of 765.
Indonesia has one of the lowest testing rates in the world, and some epidemiologists say that has made it harder to get an accurate picture of the extent of infections in the world's fourth most populous country.