Where does the Yale New Haven Health System case file come from?

Every entry is taken from the breach report Yale New Haven Health System lodged with the Massachusetts Attorney General. Nothing here is estimated.

Why do the incident date and the report date differ?

Companies usually investigate before they report. The gap between the two dates shows how long that took.

What does the records-affected figure count?

It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.

Does this case file change over time?

Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Case file

Case File: Yale New Haven Health System Data Breach

This file collects the dated facts on record for the Yale New Haven Health System incident. The state report is dated April 11, 2025.

Timeline

April 11, 2025Report filed in MassachusettsDate the notice was lodged with the Massachusetts Attorney General.

Case facts

Filing state: Massachusetts
Date reported: April 11, 2025
Receiving office: Massachusetts Attorney General

Case notes

On April 11, 2025, the Yale New Haven Health System filed a report with the Massachusetts Attorney General detailing a data security incident. The exact nature of this breach and the number of individuals affected were not specified in the public filing. The report indicates an ongoing investigation into the matter.

The specific categories of information involved in this incident have not been disclosed in the public record. However, as a major healthcare provider, Yale New Haven Health System routinely manages sensitive personal information for patient care, billing, and administrative purposes. It is understood that the breach involved some form of this confidential data.

When personal information is exposed in a data breach, there is a potential risk of identity theft, financial fraud, or other misuse. Affected individuals should be aware of these risks and remain vigilant in monitoring their personal accounts.

Individuals who receive notification about this incident are advised to take proactive steps to safeguard their identity. This includes reviewing bank and credit card statements for unauthorized transactions, checking explanations of benefits from their health insurer for suspicious activity, and obtaining free credit reports from the major bureaus.

Consider placing a fraud alert or a security freeze on your credit files. A fraud alert makes it harder for identity thieves to open new accounts in your name, while a security freeze restricts access to your credit report, preventing new credit from being opened without your permission.

Questions about this case file

Where does the Yale New Haven Health System case file come from?: Every entry is taken from the breach report Yale New Haven Health System lodged with the Massachusetts Attorney General. Nothing here is estimated.
Why do the incident date and the report date differ?: Companies usually investigate before they report. The gap between the two dates shows how long that took.
What does the records-affected figure count?: It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.
Does this case file change over time?: Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Massachusetts data breaches

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Timeline

Case facts

Case notes

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