DISCLOSURES: Ms Beinfeld and Nahn and Drs Whittington, Mohammed, and Pearson report grants from Arnold Ventures, Kaiser Foundation Health Plan Inc., The Patrick and Catherine Weldon Donaghue Medical Research Foundation, Blue Cross Blue Shield of Massachusetts, and The Commonwealth Foundation, during the conduct of the study; and other from America's Health Insurance Plans, Anthem, AbbVie, Alnylam, AstraZeneca, Biogen, Blue Shield of CA, Cambia Health Services, CVS, Editas, Express Scripts, Genentech/Roche, GlaxoSmithKline, Harvard Pilgrim, Health Care Service Corporation, Health Partners, Johnson & Johnson (Janssen), Kaiser Permanente, LEO Pharma, Mallinckrodt, Merck, Novartis, National Pharmaceutical Council, Premera, Prime Therapeutics, Regeneron, Sanofi, United Healthcare, HealthFirst, Pfizer, Boehringer-Ingelheim, uniQure, Humana, Sun Life, and Envolve Pharmacy Solutions, outside the submitted work. Dr Yeung received a contract from ICER to be an evidence author for COVID-19 outpatient treatments.