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Timing of symptoms and qualifications of Post-COVID Conditions. a EHR: Electronic Health Record; CPT: Current Procedure Terminology Code; NDC: National Drug Code. *COVID-19 cases will be identified based on a positive laboratory test (i.e., nucleic acid- or antigen-based tests, using LOINC or SNOMED CT codes), encounter-level clinical diagnosis using ICD-10-CM codes, or report of a positive COVID-19 test in clinical records/notes. The date of an individual鈥檚 COVID-19 diagnosis is defined as Day 0. PCC is defined as the presence of one or more conditions 1鈥�18聽months after COVID-19 diagnosis that was not present prior to COVID-19 diagnosis. **See Additional file 1. b *List of Catchment areas: Arizona (statewide), Indiana (statewide), Philadelphia (i.e., 24 selected zip codes: 19111, 19114鈥�19116, 19120鈥�19126, 19129, 19130, 19132鈥�19136, 19138, 19140, 19141, 19144, 19149, 19152), and the Bronx Borough of New York City. **Questionnaires associated with Resolution of symptoms, Treatments, Quality of life, Mental health, Activities of Daily Living