Artemis Healthcare Data Breach Exposes Sensitive Patient Info

On Dec. 23, 2025, Artemis Healthcare Inc. began notifying individuals of a significant data breach that exposed sensitive personal information after a ransomware attack. The incident was first discovered on May 31, 2025, when Artemis detected suspicious activity on its network.

The subsequent investigation, supported by third-party forensic specialists, revealed that unauthorized access to Artemis's systems occurred over nearly a month, from May 5 to May 31, 2025. The attackers, identified as a ransomware group, infiltrated the company’s network, potentially viewing or exfiltrating files containing confidential data. Shortly after, the cyber threat group, crypto24, took accountability for the breach.

The breach affected an undisclosed number of individuals whose information was handled by Artemis in connection with its healthcare services. The specific types of information exposed vary by individual, but may include names, Social Security numbers, dates of birth, addresses, and other personally identifiable information (PII). For some, protected health information (PHI) may also have been involved, depending on the nature of their relationship with Artemis.

The company completed its investigation on Sept. 12, 2025, and began the notification process soon after. Artemis Healthcare disclosed the data breach to the Attorney General's offices in Vermont on Dec. 29. 2027.

This incident is considered severe due to the length of unauthorized access, the involvement of a ransomware group, and the types of data at risk. The attackers’ ability to compromise the network for nearly a month increased the likelihood that sensitive information could be misused for identity theft or fraud.

Artemis Healthcare's response

Artemis Healthcare responded to the breach by immediately securing its systems, force changing passwords, terminating active sessions, and engaging cybersecurity experts to investigate the incident. The company has since reviewed and updated its security policies and procedures, and it is providing additional training to employees to help prevent future incidents.

If you believe your personal information may have been compromised in this breach:

• Carefully review any notice or communication you receive from Artemis Healthcare or a company that does business with Artemis Healthcare.
• Monitor financial accounts and credit reports for signs of identity theft.
• Consider placing fraud alerts or credit freezes with the major credit bureaus.
• Be cautious of unsolicited emails or phone calls requesting personal information.

For those affected, Artemis has set up a dedicated toll-free assistance line at 1-844-990-2040, available Monday through Friday from 9 a.m. to 9 p.m. ET.