Glendora Surgery Center Data Breach Exposes Medical Information of Patients

Glendora Surgery Center, an outpatient surgical facility in Glendora, California, disclosed a data breach.

The breach was disclosed to the U.S. Department of Health and Human Services on March 27, 2026. Glendora Surgery Center discovered the breach on Dec. 3, 2025, and has since posted a notice about the incident on its website.

An unauthorized party accessed and removed medical information from a limited portion of Glendora Surgery Center's computer network between Nov. 29 and Dec. 3, 2025. After identifying suspicious activity on its network, the company launched an investigation with the assistance of third-party cybersecurity specialists to determine the nature and scope of the event.

The investigation determined that information relating to certain Glendora Surgery Center patients had been taken from the network without authorization during that five-day period.

The types of information present within the impacted systems included names and medical treatment information.

Glendora Surgery Center's response to the breach

The company encouraged those affected to remain vigilant against incidents of identity theft and to report any suspicious activity to their insurance company, health care provider or financial institution.

Individuals with additional questions can contact the company's designated toll-free assistance line at 888-202-1910, available Monday through Friday from 9:00 a.m. to 9:00 p.m. Eastern time, excluding U.S. holidays.

Individuals may also write to Glendora Surgery Center at 541 S. Pasadena Ave., Suite 101, Glendora, CA 91741.

Steps to take if affected by the Glendora Surgery Center data breach

• Review Explanation of Benefits statements from health insurers for any medical services or treatments not actually received, as exposed medical treatment information could potentially be misused for fraudulent health care claims.
• Request free credit reports at AnnualCreditReport.com and review them for any unfamiliar accounts or inquiries, even though financial data was not reported as exposed in this breach.
• Be cautious of phishing attempts that reference Glendora Surgery Center or this data breach by name, as scammers sometimes use real breach notifications to trick people into sharing additional personal information.
• Consider placing a fraud alert or credit freeze with the three major credit reporting bureaus (Equifax at 1-888-298-0045, Experian at 1-888-397-3742 and TransUnion at 1-833-799-5355) as a general precautionary measure.
• Contact your health care providers if you notice any unfamiliar medical records, prescriptions or treatment histories associated with your name, as these could be signs of medical identity fraud.