Catalyst Physician Group Reports Data Breach Impacting Patient Data
Catalyst Physician Group has filed a notification with the California Attorney General regarding a data security incident that occurred in December 2025. This breach potentially exposed a range of highly sensitive patient information, including medical and personal identifiers, to unauthorized access. Affected individuals should review official notices for specific details and consider general protective measures.
- State
- California
- Breach date
- December 2, 2025
- Reported
- September 11, 2026
What may have been exposed
- Full Name
- Date of Birth
- Social Security Number
- Medical Record Number
- Health Insurance ID Number
- Diagnosis and Treatment Information
- Prescription Information
- Provider and Treatment Dates
- Billing and Financial Information
Catalyst Physician Group, a healthcare provider operating in California, reported a data security incident to the California Attorney General on September 11, 2026. The organization indicated that the breach date was December 2, 2025. This disclosure alerts affected individuals that their private information may have been accessed without authorization.
The compromised data types reported in public filings include Full Name, Date of Birth, Social Security Number, Medical Record Number, Health Insurance ID Number, Diagnosis and Treatment Information, Prescription Information, Provider and Treatment Dates, and Billing and Financial Information. These categories represent a significant scope of personal and health-related details collected during medical care.
Exposure of such sensitive data can lead to various risks for affected individuals. The combination of identity details like Full Name, Date of Birth, and Social Security Number can facilitate identity theft and financial fraud. Additionally, the compromise of medical information such as Diagnosis and Treatment Information or Prescription Information could lead to medical identity theft, where individuals' healthcare benefits might be misused or their medical records altered.
Individuals who receive a breach notification from Catalyst Physician Group are advised to carefully read the information provided. It is generally recommended to remain vigilant for any unusual activity on financial accounts, review explanation of benefits statements from health insurers for unauthorized services, and consider monitoring credit reports for suspicious inquiries or new accounts. Be cautious of unsolicited communications, especially those asking for personal details.