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San Bernardino County on behalf of Arrowhead Regional Medical Center data breach

San Bernardino County, on behalf of Arrowhead Regional Medical Center, reported a data breach in September 2026. This incident exposed sensitive personal and medical information, potentially including your Full Name, Date of Birth, Social Security Number, and detailed health records. For those affected, this breach carries risks such as medical identity theft and financial fraud due to the nature of the compromised data.

Incident readout

Company
San Bernardino County on behalf of Arrowhead Regional Medical Center
Reported to
California Attorney General
Filed
September 28, 2026
People affected
Not stated in the filing
Incident type in filing
Not stated
Our review
Monitoring
Read the official filing

Was this a ransomware attack?

The filing does not say ransomware was involved. We do not label an incident ransomware unless the company’s report says so. Whatever the cause, the steps to protect yourself and the legal question are the same.

Information listed in the filing

  • Full Name
  • Date of Birth
  • Social Security Number
  • Medical Record Number
  • Health Insurance ID Number
  • Diagnosis and Treatment Information
  • Prescription Information
  • Provider and Treatment Dates

What we know

San Bernardino County, operating Arrowhead Regional Medical Center (ARMC) in California, recently reported a data security incident. This breach, discovered on August 28, 2026, and reported on September 28, 2026, potentially compromised highly sensitive personal and health information of individuals associated with the medical center. The exact nature of the intrusion is currently under investigation.

According to the official notification, the exposed data types include Full Name, Date of Birth, Social Security Number, Medical Record Number, Health Insurance ID Number, Diagnosis and Treatment Information, Prescription Information, and Provider and Treatment Dates. This combination of identifiers and medical details creates significant risks for affected individuals.

The exposure of such comprehensive personal and health information can lead to various forms of identity theft and fraud. Criminals may use your Social Security Number and Date of Birth for financial account takeovers or to open new lines of credit. Compromised medical information, including your Medical Record Number and Diagnosis and Treatment Information, could be used for medical identity theft, where fraudsters obtain healthcare services under your name, leading to inaccurate medical records and potential difficulties in receiving proper care.

If you received a data breach notification from San Bernardino County on behalf of Arrowhead Regional Medical Center, it is important to take immediate steps. Carefully review the letter for specific details about the incident and any offers of credit monitoring or identity protection services. Enroll in these services if provided. Monitor your financial statements, credit reports, and Explanation of Benefits (EOB) from your health insurer for any suspicious activity or unauthorized medical services.

Under California law and federal regulations like HIPAA, entities like Arrowhead Regional Medical Center are obligated to protect your personal and health information. A data breach suggests that these safeguards may have been insufficient. You may have legal rights as a victim of this data exposure. Our firm is currently investigating the San Bernardino County/Arrowhead Regional Medical Center data breach and offers free case reviews to help you understand your options without any upfront cost.

See every breach reported in California or read what to do after a ransomware attack.

After the San Bernardino County on behalf of Arrowhead Regional Medical Center incident: what to do and your options

What should I do after getting the San Bernardino County on behalf of Arrowhead Regional Medical Center 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.
How many people were affected by the San Bernardino County on behalf of Arrowhead Regional Medical Center data breach, and what was exposed?
The filing does not give a count of affected people and lists the following information as involved: Full Name, Date of Birth, Social Security Number, Medical Record Number, Health Insurance ID Number, Diagnosis and Treatment Information, Prescription Information, Provider and Treatment Dates. Your own letter is the best guide to what was exposed about you, since notices are usually tailored to each person.
Did San Bernardino County on behalf of Arrowhead Regional Medical Center offer free credit monitoring?
Look for an enrollment code in your San Bernardino County on behalf of Arrowhead Regional Medical Center notice. Companies that offer free credit monitoring after a breach usually include it there, with a deadline to activate. Because Social Security numbers are listed in this filing, identity monitoring and a credit freeze matter more than usual. Signing up doesn't waive any legal rights you may have.
Where can I see the official San Bernardino County on behalf of Arrowhead Regional Medical Center breach notice?
San Bernardino County on behalf of Arrowhead Regional Medical Center's report is published by the California Attorney General: https://oag.ca.gov/privacy/databreach/reporting Compare it with the letter you received to confirm the dates and details match.
Can I sue San Bernardino County on behalf of Arrowhead Regional Medical Center over the data breach?
It depends on what was exposed, the law in California 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.
Do I need a San Bernardino County on behalf of Arrowhead Regional Medical Center data breach lawyer or attorney?
Whether the company's systems were encrypted by ransomware or data was simply taken, the legal question is the same: did it protect your information the way the law requires? An attorney can review your notice for free, and these cases are usually handled on contingency.
Is there a San Bernardino County on behalf of Arrowhead Regional Medical Center 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 San Bernardino County on behalf of Arrowhead Regional Medical Center. 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.
Is the San Bernardino County on behalf of Arrowhead Regional Medical Center data breach letter legit or a scam?
A notice from San Bernardino County on behalf of Arrowhead Regional Medical Center in the mail matches the breach San Bernardino County on behalf of Arrowhead Regional Medical Center reported to the California Attorney General on September 28, 2026. 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 San Bernardino County on behalf of Arrowhead Regional Medical Center through a phone number or website you find yourself.
How much could a San Bernardino County on behalf of Arrowhead Regional Medical Center data breach settlement or claim be worth?
There is no set amount, and no San Bernardino County on behalf of Arrowhead Regional Medical Center 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 Full Name, Date of Birth, Social Security Number as involved. Keep receipts and records; they're what damages claims are built on.

Other breaches reported in California

Attorney advertising. This page reflects a public regulator filing; 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.