2021 CORPORATE RESPONSIBILITY REPORT I 74 SASB Code Metric Response HC-DY-230a.3 ( 1) Number of data breaches, (2) percentage involving (a) personally identifiable information (PII) only and (b) protected health information (PHI), (3) number of customers affected in each category, (a) PII only and (b) PHI Not reported HC-DY-230a.4 Total amount of monetary losses because of legal proceedings associated with data security and privacy When public disclosure criteria are met, monetary losses as a result of legal proceedings associated with data security and privacy are included in Quest Diagnostics Annual Report on Form 10-K. Access for Low-Income Patients HC-DY-240a.1 Discussion of strategy to manage the mix of patient insurance status Quest Diagnostics is committed to providing service to all patients, including those who have commercial or government insurance or are uninsured. Through our Patient Assistance Program, we tailor solutions for uninsured or underinsured patients based on individual circumstances. HC-DY-240a.2 Amount of Medicare Disproportionate Share Hospital (DSH) adjust ment payments received Not applicable – Quest Diagnostics does not operate hospitals. Quality of Care & Patient Satisfaction HC-DY-250a.1 Average Hospital Value-Based Purchasing Total Performance Score and domain score, across all facilities Not applicable – Quest Diagnostics does not operate hospitals. HC-DY-250a.2 Number of Serious Reportable Events (SREs) as defined by the National Quality Forum (NQF) Not applicable – Quest Diagnostics does not operate hospitals. HC-DY-250a.3 Hospital-Acquired Condition (HAC) Score per hospital Not applicable – Quest Diagnostics does not operate hospitals. HC-DY-250a.4 Excess readmission ratio per hospital Not applicable – Quest Diagnostics does not operate hospitals. HC-DY-250a.5 Magnitude of readmissions payment adjustment as part of the Hospital Readmissions Reduction Program (HRRP) Not applicable – Quest Diagnostics does not operate hospitals. Management of Controlled Substances HC-DY-260a.1 Description of policies and practices to manage the number of prescriptions issued for controlled substances Not applicable – Quest Diagnostics does not issue prescriptions for controlled substances. Table 1: Health Care Delivery Industry Standard Accounting Metrics (Continued) TABLE OF CONTENTS 2021 OVERVIEW COVID-19 RESPONSE PROMOTING A HEALTHIER WORLD CREATING AN INSPIRING WORKPLACE BUILDING VALUE REFERENCES