Parexel International Reports Data Breach Exposing Sensitive Clinical Data

Parexel International, LLC, a major clinical research organization, filed notice of a data breach with the state of Montana on December 17, 2025. The company stated the incident took place on October 4, 2025. The specific nature of the breach was not detailed in public records, but it resulted in the compromise of highly sensitive personal and health-related data.

The exposed data categories include Full Name, Date of Birth, Social Security Number, Medical Record Number, Health Insurance ID Number, Clinical Trial Participation Records, Diagnosis and Treatment Information, and Contact Information. Given Parexel's role in managing complex medical studies, this type of information is central to its operations.

Such breaches can present significant risks to affected individuals. The exposure of Full Name, Date of Birth, and Social Security Number can be leveraged for various forms of identity theft. Additionally, the compromise of Medical Record Number, Health Insurance ID Number, Clinical Trial Participation Records, and Diagnosis and Treatment Information raises concerns about medical identity theft and privacy breaches.

Individuals who receive notification about this incident should remain vigilant. It is recommended to carefully review all financial statements and health-related communications for any unauthorized activity. Monitoring credit reports can help detect early signs of fraudulent accounts or credit inquiries.

To help protect against potential misuse of exposed data, consider placing a fraud alert or security freeze on your credit files with the three major credit bureaus: Equifax, Experian, and TransUnion. Additionally, be cautious of unsolicited communications, especially those requesting personal information, as these could be phishing attempts.