WISCONSINHackingHealthcareHealthcareCustomer Data InvolvedPHIHealth (basic)Identity (basic)Medium

Marshfield Clinic Health System, Inc.

bd_cbe18927634e73f2 · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Nov 7, 2025

To disclose

—

Affected

35,952

Linked

2 filings

Confidence

68%

Full breach record for Marshfield Clinic Health System, Inc. →

Marshfield Clinic Health System reported to HHS on 2025-11-07 a Hacking/IT Incident affecting 35952 individuals. Breached information located on Email.

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HIPAA clock✓ HHS notified

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

⚠ No discovery dateThe OCR public portal omits the discovery date, so the 60-day notification clock cannot be evaluated from this source — only that the filing was submitted.

Incident timeline — partial

? — ?

Breach window unknown

Nov 7, 2025

Filed

—

Corroborated · see linked filings

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Illinois State AGbd_51e104f254e1f3812025-11-01 · +6dCandidate

Name: Marshfield Clinic Health System, Inc.
norm: marshfield clinic health system
Industry: Health Care Services

Name: Marshfield Clinic Health System, Inc.
norm: marshfield clinic health system
Industry: Healthcaresource default

Discovered: Not extracted — the OCR public portal omits it
Materiality determined: —
Notification sent: —
Affected individuals: 35,952nationwide
Data types: PHIHealth (basic)Identity (basic)
HHS breach type: Hacking / IT incident
Where the data lived: Email
Covered-entity type: Healthcare provider
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Notified HHS OCR

Compliance flags: HHS notified
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
Clock breakdown: Statute Window Elapsed Threshold Status
HIPAA
Discovered: not extracted
→ Notified: not extracted
— regulatory submission HHS notified

Statute	Window	Elapsed	Threshold	Status
HIPAA	Discovered: not extracted → Notified: not extracted	—	regulatory submission	HHS notified

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Illinois State AGNov 1 · first

HHS OCR+6d · this page

Pattern: first filing Nov 1 (IL), last Nov 7 (WI) — a 6-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://ocrportal.hhs.gov/ocr/breach/breach_report.jsf
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Nov 7, 2025
Raw hash: 153d6002abb02a36d7b924833cd3666c505539933918123f3d724cd5f311ed5d

AI-assisted summary above. The structured extract on this page was generated from the document below. Inspect the source to verify or correct any field.

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Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityMarshfield Clinic Health System, Inc.

Victim entityMarshfield Clinic Health System, Inc.

IncidentUnauthorized Access

ComplianceHHS notified

Extraction provenanceno artifact recorded

Source provenanceocrportal.hhs.gov

Source filing