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The ICD10 guidance is evolving for Morbidity (inpatients), so it covers Positive but asymptomatic, Positive with symptoms like SoB or coughing, Positive with manifestations (pneumonia). It also now has guidance for suspected/probable cases, so expect that to rocket.
Cause of deaths are taken from the death certificates and is Mortality coding, though it uses the same codes. U07.1 and U07.2.
I'd be interested in how they are measuring recovery rates, given that they are probably discharging home if stable to recover, to make sure hospitals only have the unstable patients. Is it positive to negative tests?
It's a lag of 11 days from death certification IIRC.
Also:
https://www.ons.gov.uk/peoplepopulationandcommunity/birthsdeathsandmarriages/deaths/bulletins/deathsregisteredweeklyinenglandandwalesprovisional/latest
So there will be a difference in the numbers because of the time taken to register a death. They should all marry up eventually.
Also: there is now snomed/icd 10 coding to use, which should make it easier for coding (though that's been around for a bit hasn't it? )