Where does the MARSHFIELD CLINIC HEALTH SYSTEM case file come from?

Every entry is taken from the breach report MARSHFIELD CLINIC HEALTH SYSTEM lodged with the Illinois 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: MARSHFIELD CLINIC HEALTH SYSTEM Data Breach

This file collects the dated facts on record for the MARSHFIELD CLINIC HEALTH SYSTEM incident. The state report is dated September 25, 2025.

Timeline

September 25, 2025Report filed in IllinoisDate the notice was lodged with the Illinois Attorney General.

Case facts

Filing state: Illinois
Date reported: September 25, 2025
Receiving office: Illinois Attorney General

Case notes

Marshfield Clinic Health System has submitted a data breach notification to regulators in Illinois, documenting an incident involving personal information. The filing, dated September 25, 2025, indicates that the circumstances surrounding the breach are currently under investigation.

The official public record does not specify the particular type of data that may have been exposed as a result of this incident. Similarly, the filing does not detail the nature of the breach itself, only confirming that an event occurred where personal information was compromised.

Since the specific categories of information involved are not detailed in the public filing, individuals are advised to refer to any direct notification letters they may receive from Marshfield Clinic Health System. These official communications typically provide the most accurate and personalized information regarding data incidents.

As a general precaution following any data security event, it is advisable to remain vigilant against potential misuse of personal information. This includes reviewing financial account statements for unusual activity and monitoring credit reports for unauthorized accounts or inquiries.

Consider placing a fraud alert or security freeze on your credit files as an added layer of protection. Be cautious of unsolicited emails, phone calls, or texts that request personal details, as these could be attempts at phishing.

Questions about this case file

Where does the MARSHFIELD CLINIC HEALTH SYSTEM case file come from?: Every entry is taken from the breach report MARSHFIELD CLINIC HEALTH SYSTEM lodged with the Illinois 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.

Illinois data breaches

Filing source: Illinois Attorney General

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Timeline

Case facts

Case notes

Questions about this case file

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