✅ Official notice on file. Cornerstone Care Center filed this data breach notice with the California Attorney General on May 7, 2026. Compare it with the letter you received: the official copy is linked below.
Cornerstone Care Center reported a data breach. The information involved includes medical information, username / password, home address.
Key facts
| Discovered | Apr 16, 2026 |
|---|---|
| Data exposed | Medical information, Username / password, Home address |
| Letter sent | May 7, 2026 |
| Reported to California AG | May 7, 2026 |
| Company helpline | 1-866-653-4261 |
Free credit monitoring
Cornerstone Care Center is offering 12 months of Cyberscout (TransUnion) at no cost to people who received the letter.
What to do now
- Review the Explanation of Benefits statements from your insurer for services you never received.
- Change the password on this account and on any other site where you reused it, and turn on two-factor authentication.
- Get your free credit reports at AnnualCreditReport.com and look for accounts you do not recognize.
- Call the Cornerstone Care Center helpline at 1-866-653-4261 if you have questions about your letter.
Timeline
- Apr 16, 2026 — Cornerstone Care Center discovers the incident
- May 7, 2026 — Notification letters sent
- May 7, 2026 — Breach reported to the California Attorney General
Other recent data breaches
- Deposition Solutions, LLC data breach
- Mercadien, P.C. CPAs data breach
- Toyo Tire Holdings of Americas Inc. data breach
- STS Aviation Group data breach
- Alma Family Services data breach
Source: notification letter and filing submitted by Cornerstone Care Center to the California Attorney General. BreachLetter is not affiliated with Cornerstone Care Center. Details extracted from the official letter; always follow the instructions in your own copy.