Archer Health Data Breach Exposes Sensitive Patient Data

On Nov. 6, 2025, Archer Health, a provider of onsite and on-demand healthcare services for businesses, reported a significant data breach to the U.S. Department of Health and Human Services. According to the official disclosure, the breach compromised personally identifiable information (PII) and protected health information (PHI) of at least 4,285 individuals across the U.S.

The attack was first made public on the dark web on Sept. 7, 2025, when KillSec announced they had accessed Archer Health’s data and threatened to publish it within seven to eight days. The nature of the breach was classified as ransomware, indicating that attackers not only encrypted files but also exfiltrated data, a tactic increasingly used to pressure organizations into paying a ransom.

Compromised information includes names, dates of birth, Social Security numbers and medical information. The exposure of both PII and PHI puts individuals at risk of identity theft and medical fraud. In addition to reporting the breach to relevant authorities, the company has posted a notice of data privacy incident on its website.

Archer Health's response

In response to the breach, Archer Health has notified the U.S. Department of Health and Human Services and begun the process of informing affected individuals. Because the breach involved ransomware and the threat of data publication on the dark web, those impacted should be vigilant for signs of identity theft, fraud or phishing attempts.

It is recommended that affected individuals:

• Sign up for the complimentary identity monitoring services offered by Archer Health
• Monitor credit reports and financial statements for unusual activity
• Consider placing a fraud alert or credit freeze with major credit bureaus
• Be cautious of unsolicited communications that request personal or financial information
• Watch for suspicious emails or phone calls that may use stolen information for phishing

To learn more information about this data breach, impacted individuals can contact Archer Health's dedicated call center at 833-779-5787, available Monday to Friday, between 6:00 a.m. and 6:00 p.m., PT.