21st Century Oncology

Organization

21st Century Oncology

Source

California AG · source record

Date reported

Mar 4, 2016

Date(s) of breach

n/a

Residents affected

Not published by this source

Data exposed

Social Security number Medical / health information Health insurance Name

Notice letter

Sample notice (PDF)

Discovered

Oct 3, 2015, as stated in the letter

"The forensics firm determined that, on October 3, 2015, the intruder may have accessed the database, which contained information that may have included your name, Social Security number, physician’s name, diagnosis and treatment informat..."

Days to notice

153 days from discovery (Oct 3, 2015) to the California record (Mar 4, 2016). Statute: 30 days from discovery or notification of the breach (Cal. Civ. Code § 1798.82). Over the statutory period

Offered in the letter

12 months of credit or identity monitoring through Experian

Third party

The letter attributes the incident to a vendor or service provider

First seen by BreachTally

2026-10-30 16:21 UTC

Dates and counts as filed by the organization with the agency. The breach window and the report date often differ by months.