Mainline Health Systems recently announced that it had experienced a very significant and serious data security breach. The Arkansas-based healthcare provider said sensitive personal and protected health information in its systems may have been compromised. Mainline provides both medical and dental care with sixteen in-school clinics and thirteen different health clinics. On or around April 10, 2024, Mainline experienced a data security incident that prompted a full internal investigation. The company, which was founded in 1978, is headquartered in Monticello, Arkansas and employs more than sixty people.
As a result of the initial incident, Mainline immediately launched an investigation to determine the attack’s nature. Through its extensive investigation, on May 21, 2025, Mainline confirmed that sensitive personal information was accessed. An unauthorized third party had accessed and acquired the important data that was stored within the company’s network. As a result, Mainline began a very thorough review of the data to determine what information had been impacted.
They also worked diligently to identify all of the specific individuals who had been affected by the security breach.
While the specific information impacted varies depending on the individual, the types of information exposed are numerous. This includes names, Social Security numbers, dates of birth, driver’s license numbers, and also various financial information. More alarmingly, exposed medical information includes medical record numbers, diagnoses, treatment information, and even prescription information. Health insurance information, such as policy numbers and group numbers, was also potentially exposed during this breach.
The significant data breach has impacted just over 101,000 people, according to a recent report from the company.
The Inc Ransom ransomware group took credit for the attack on Mainline Health Systems back in May 2024. This specific threat actor is well-known for launching many different attacks against the United States healthcare sector. As a result of this data breach, Mainline posted a notice of the incident on its official website. On June 20, 2025, Mainline began sending out official breach notification letters to all of the impacted individuals. The company is providing affected individuals with a list of the specific types of their information impacted. Mainline is also providing all of these affected individuals with complimentary credit monitoring and identity theft protection services.
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