COVID Cohort Definition

CEC-UW defined a “COVID case” as any patient seen in any of the 21 selected health systems from February 1 to December 31, 2020, who met at least one of the following three criteria:

Doctor takes a swab sample from a potential COVID patient

  • A positive COVID-19 PCR test and/or
  • An ICD-10 diagnostic code for COVID and/or
  • A positive COVID-19 antibody test

These included inpatients, outpatients, emergency admissions, and telehealth visits.

CEC-UW Essentials

370,000 COVID patients

21 health systems

Harmonized EHR Data