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> Filed as: Unauthorized Disclosure

Kaiser Foundation Health Plan data breach investigation

Filed
March 12, 2026
Regulator
California Attorney General
People affected
13,400,000
File status
Monitoring

What the filing confirms

  • Kaiser Foundation Health Plan reported the incident to the CA Attorney General.
  • The company describes it as “Unauthorized Disclosure.”
  • 13,400,000 people were notified.
  • Information involved: member names, IP addresses, health-related web activity.

Still unknown

  • What caused the incident beyond the description in the filing.
  • How the attackers got in, and whether basic safeguards such as multi-factor sign-in were in place.

Investigation notes

Online tracking technologies transmitted member information to third-party vendors.

What our attorneys examine

A cyberattack does not excuse a company from protecting the information it holds. We look at whether Kaiser Foundation Health Plan used reasonable security, how long it kept the data, and how quickly it told the people affected. Those questions decide whether a class action or individual claim is possible. Read more on how ransomware lawsuits work, or browse other incident files in CA.

Kaiser Foundation Health Plan data breach questions

How many people were affected by the Kaiser Foundation Health Plan data breach, and what was exposed?
Kaiser Foundation Health Plan reported that about 13,400,000 people were affected and lists the following information as involved: member names, IP addresses, health-related web activity. Your own letter is the best guide to what was exposed about you, since notices are usually tailored to each person.
Is the Kaiser Foundation Health Plan data breach letter legit or a scam?
A notice from Kaiser Foundation Health Plan in the mail matches the breach Kaiser Foundation Health Plan reported to the CA Attorney General on March 12, 2026, which covers about 13,400,000 people. Check that the company name and dates in your letter match that filing. A real notice of data security incident won't ask for your password, Social Security number or a payment — if it does, contact Kaiser Foundation Health Plan through a phone number or website you find yourself.
Did Kaiser Foundation Health Plan offer free credit monitoring?
Check your letter from Kaiser Foundation Health Plan. If free credit or identity monitoring is offered, the enrollment code and deadline are printed in the notice itself. Because health or insurance details are listed in this filing, also review the benefit statements from your insurer. Enrolling does not give up your right to bring a claim.
Is there a Kaiser Foundation Health Plan data breach class action lawsuit?
Law firms often open an investigation after a breach notice like this one, and a class action lawsuit may follow. This page doesn't confirm that a lawsuit has been filed against Kaiser Foundation Health Plan. You usually don't have to join a class action to be included — if a settlement is reached, class members are notified and can file a claim.
What should I do after getting the Kaiser Foundation Health Plan data breach notice?
Keep the letter and the envelope, and note the date it arrived. Freeze your credit with Equifax, Experian and TransUnion, change any passwords the notice mentions, and sign up for any free credit monitoring the letter offers. Then check whether you may have a claim.
Do I need a Kaiser Foundation Health Plan data breach lawyer or attorney?
An attorney can read your notice and tell you whether a claim makes sense. A case review here is free, and data breach cases are usually handled on contingency, so there is no upfront cost.
Can I sue Kaiser Foundation Health Plan over the data breach?
It depends on what was exposed, the law in CA and your own state, and whether you've been harmed. Most people take part through a class action rather than suing alone. Keep your notification letter — it's the proof that connects you to the breach.
How much could a Kaiser Foundation Health Plan data breach settlement or claim be worth?
There is no set amount, and no Kaiser Foundation Health Plan settlement is confirmed here. In past data breach settlements, payments depended on what data was exposed and on documented losses — fraud, out-of-pocket costs and time spent dealing with the breach. The filing lists member names, IP addresses, health-related web activity as involved. Keep receipts and records; they're what damages claims are built on.

Other open files in CA

Attorney advertising. An incident file reflects a public regulator filing and our review of it; it does not mean a lawsuit has been filed or that the company did anything unlawful. Submitting a review request does not create an attorney-client relationship.