Breachesby GlyphQuest Diagnostics
Disclosed Jun 3, 201911,900,000 affectedConfirmed
Billing vendor AMCA breach exposes data of 11.9 million Quest patients
Quest Diagnostics said an unauthorized user had access to the web payment system of its collections vendor American Medical Collection Agency between August 2018 and March 2019, which held data on about 11.9 million Quest patients.
What is known
| People affected | 11,900,000 (as reported by the organization) |
|---|---|
| Disclosed | Jun 3, 2019 |
| Attack | Vendor breach |
| Data exposed | NamesFinancialPayment cardsHealthSocial Security numbers |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
Notices filed
Other breaches at Quest Diagnostics
Cybersecurity incident disclosed to the SEC (8-K Item 8.01)Cybersecurity incident disclosed to the SEC (8-K Item 8.01)HackingHealthcareUSOct 22Insider breachInsider exposed names and health records. Reported to the HHS archive.1,062 affectedHealthcareUSOct 25, 2024Breach, details not statedBreach notice filed with the California AG, details not stated.5,325 affectedHealthcareUSNov 16, 2021Hacking breachHacking exposed names and health records. Reported to the California AG.34K affectedHealthcareUSDec 12, 2016Breach, details not statedExposed names and Social Security numbers. Reported to the California AG.HealthcareUSDec 19, 2014
History of this record
First recordedby seedSource
First seen 2026-09-25 (Research), confirmed by Research. Record counts are as reported. Not legal advice.