California's San Jose Medical Supply Company recently began notifying current and former customers of a breach of their personal information, which took place in 2011 but was only recently discovered by the company's new management.

When the company's former owned died in August 2011, the company continued operating under the management of trustees.

In August 2012, current president Jesille Kuizon purchased the company, and discovered what Kuizon describes in the notification letter [PDF] as "suspicious activity taken by the former employees, officers and/or agents of the prior owner, which may have compromised the security of your health information."

It wasn't until June of 2013, Kuizon writes, that the company determined that customers' personal information had been disclosed to competitors Front Medical Supplies, Inc. and/or Living Medical Equipment, Inc, including customers' full names, birthdates, Social Security numbers, home addresses, Medi-Cal ID numbers, physicians' names and contact information, prescriptions, past invoices, diagnoses and Disability Codes.

The company is advising current and former customers to register a fraud alert with the three major credit bureaus, and to monitor their financial and health account statements and credit bureau reports for suspicious activity.