Table 3 shows the types of health conditions and contributing causes mentioned in conjunction with deaths involving coronavirus disease 2019 (COVID-19). For 6% of the deaths, COVID-19 was the only cause mentioned. For deaths with conditions or causes in addition to COVID-19, on average, there were 2.6 additional conditions or causes per death. The number of deaths with each condition or cause is shown for all deaths and by age groups. For data on comorbidities,
On average, of all the deaths there were 2.6 underlying conditions.
https://www.cdc.gov/nchs/nvss/vsrr/covid_weekly/index.htm#Comorbidities