Quest Diagnostics Says Nearly 12 Million Patients Records Exposed in Data Breach

Quest Diagnostics has confirmed a data breach that exposes 11.9 million patients records that includes financial data, Social Security numbers, and medical information.

Quest Diagnostics is lab testing provider of diagnostic testing, information, and services that patients and doctors used to make better healthcare decisions.

The breach happened through a contractor of a contractor, Quest outsource billing services to Optum360, which in turn using American Medical Collection Agency(AMCA) to handle that service.

“AMCA has informed Quest Diagnostics that an unauthorized user had access to AMCA’s system containing personal information AMCA received from various entities, including from Quest.”

According to Quest, the attackers gained unauthorized access to billing systems from August 1, 2018, to May 31, 2019. Quest said it doesn’t receive any other additional information about the security incident from AMCA.

“AMCA first notified Quest and Optum360 on May 14, 2019, of potential unauthorized activity on AMCA’s web payment page.”

The leaked information includes the medical data and other personal data, Quest confirms the lab results were not exposed as it was not provided to AMCA.

“Quest is taking this matter very seriously and is committed to the privacy and security of our patients’ personal information. Since learning of the AMCA data security incident, we have suspended sending collection requests to AMCA.”

“Quest will be working with Optum360 to ensure that Quest patients are appropriately notified consistent with the law.”

Quest said it was working with AMCA and Optum360, as well as the external forensic investigators to determine the potential impact of the damage.

You can follow us on LinkedinTwitterFacebook for daily Cybersecurity updates also you can take the Best Cybersecurity courses online to keep yourself updated.

Other Recent Data Breaches

POS Malware Steals Users Payment Card Details from Checkers Drive-In Restaurants

First American Leaked 885 Million Most Sensitive Financial Data Online

Stack Overflow Breached – Hackers Accessed Stack Overflow’s Production Systems

80 Million U.S Households Sensitive Personal Data Exposed Online From Unprotected Mystery Database

Docker Hub Hacked – Hackers Gained Access to 190,000 Users Accounts

Bodybuilding.com Data Breach, Resulting from Phishing Attack Via Email

Wipro Security Breach – Employees’ accounts Hacked Through Advanced Phishing Campaign

Gurubaran

Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

Recent Posts

Hackers Exploit Cloudflare Tunnel Infrastructure to Deploy Multiple Remote Access Trojans

The Sekoia TDR (Threat Detection & Research) team has reported on a sophisticated network infrastructure…

4 hours ago

Threat Actors Leverage npm and PyPI with Impersonated Dev Tools for Credential Theft

The Socket Threat Research Team has unearthed a trio of malicious packages, two hosted on…

4 hours ago

Hackers Exploit Legitimate Microsoft Utility to Deliver Malicious DLL Payload

Hackers are now exploiting a legitimate Microsoft utility, mavinject.exe, to inject malicious DLLs into unsuspecting…

6 hours ago

Cybercriminals Exploit Network Edge Devices to Infiltrate SMBs

Small and midsized businesses (SMBs) continue to be prime targets for cybercriminals, with network edge…

6 hours ago

Criminal IP to Showcase Advanced Threat Intelligence at RSAC™ 2025

Joining Criminal IP at Booth S-634 | South Expo, Moscone Center | April 28 –…

6 hours ago

TP-Link Router Vulnerabilities Allow Attackers to Execute Malicious SQL Commands

Cybersecurity researchers have uncovered critical SQL injection vulnerabilities in four TP-Link router models, enabling attackers…

7 hours ago