Ensuring Survivor Benefits during COVID-19 Act of 2021 This bill requires the Department of Veterans Affairs to get a medical opinion to determine if a service-connected disability was the principal or contributory cause of death in situations where a veteran's death certificate identifies COVID-19 (i.e., coronavirus disease 2019) as the principal or contributory cause of death, the certificate does not clearly identify any of the veteran's service-connected disabilities as the principal or contributory cause of death, and a claim for dependency and indemnity compensation is filed with respect to the veteran.