Breach intelligence · WI
38 reported healthcare data breach incidents affecting 331.8M individuals. Sourced from 7 federal and community intelligence feeds. Updated nightly.
38
Incidents reported
331.8M
Individuals affected
Hacking
Top attack vector
Stable
6-month trend
Recent incidents
| Date | Entity | Individuals | Source | Severity |
|---|---|---|---|---|
| Apr 21, 2026 | Delta Medical Systems | 1,574 | Hhs Breach | High |
| Mar 2, 2026 | Exact Sciences Laboratories LLC | 2,658 | Hhs Breach | High |
| Jan 1, 1970 | Quartz Health Solutions, Inc. | 396,000 | State Ag | Critical |
| Jan 1, 1970 | Managed Health Services of Wisconsin | 339,272 | State Ag | Critical |
| Jan 1, 1970 | Anthem (now Elevance Health) | 78,800,000 | State Ag | Critical |
| Jan 1, 1970 | DATCP Home | 0 | State Ag | Medium |
| Jan 1, 1970 | WellDyneRx | 308,000 | State Ag | Critical |
| Jan 1, 1970 | Anthem (CivicHealth) | 24,000 | State Ag | High |
| Jan 1, 1970 | Regence BlueCross BlueShield of Oregon | 69,022 | State Ag | High |
| Jan 1, 1970 | Health Alliance Plan of Michigan | 57,470 | State Ag | High |
| Jan 1, 1970 | Molina Healthcare of Wisconsin | 14,948 | State Ag | High |
| Jan 1, 1970 | McLeod Health | 240,000 | State Ag | Critical |
| Jan 1, 1970 | The Rhode Island Department of Human Services (DHS) | 11,000 | State Ag | High |
| Jan 1, 1970 | Harvard Pilgrim Health Care | 2,500,000 | State Ag | Critical |
| Jan 1, 1970 | Managed Health Care Associates, Inc. (MHA) | 800,000 | State Ag | Critical |
| Jan 1, 1970 | Physicians' Eye Care | 42,000 | State Ag | High |
| Jan 1, 1970 | Independent Health | 35,000 | State Ag | High |
| Jan 1, 1970 | Mid-Michigan physician group | 20,000 | State Ag | High |
| Jan 1, 1970 | A-Z License List | 0 | State Ag | Medium |
| Jan 1, 1970 | Anthem, Inc. | 538 | State Ag | Medium |
Swipe to view full table →
Most affected entities
#1
3
incidents
236.4M
individuals
#2
2
incidents
342K
individuals
#3
1
incidents
396K
individuals
#4
1
incidents
0
individuals
#5
1
incidents
308K
individuals
Attack vectors
Breakdown of breach types reported across 38 incidents in Wisconsin. Understanding which vectors dominate helps practices prioritize their security controls.
Wisconsin compliance requirements
Beyond federal HIPAA requirements, Wisconsin has its own breach notification law that may impose additional obligations on healthcare practices operating in the state.
Wis. Stat. § 134.98
Notification deadline
45 days
Shorter than HIPAA's 60-day notification window.
Attorney General notification
Not required
This is a general reference based on current Wisconsin law. Consult legal counsel for state-specific compliance obligations. Source: Wis. Stat. § 134.98. Verified April 2026.
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FAQ
Patient Protect tracks 38 reported healthcare data breach incidents in Wisconsin, affecting approximately 331.8M individuals. Data is sourced from HHS OCR, State Attorney General offices, FTC enforcement, and community intelligence — updated nightly.
The most frequently reported breach vector in Wisconsin is Hacking, accounting for 20 of 38 incidents. Supply chain attack is the second most common with 5 incidents.
Independent healthcare practices are the fastest-growing target for healthcare cyberattacks nationwide — attacks on small providers have increased 6x since 2021. Wisconsin practices face the same threat landscape with fewer resources to defend against it. Patient Protect provides breach prevention specifically for independent practices starting at $39/month.
Wisconsin requires breach notification within 45 days. These requirements apply in addition to federal HIPAA's 60-day notification deadline. Reference: Wis. Stat. § 134.98.
Explore the full breach intelligence dashboard with 12 analytical views, risk forecasting, and attack chain visualization.
Open full dashboardData Disclaimer: This data is aggregated from publicly available sources including the HHS OCR Breach Portal, FTC, state AG databases, CISA advisories, and curated reporting. Certain records are algorithmically modeled from news sources and labeled accordingly. Data is provided “as-is” for informational purposes only. Inclusion of any entity does not imply wrongdoing. Users must independently verify information before relying on it. See Terms of Use.
Editorial coverage · From our partner publication
Editorial analysis of the breaches and enforcement actions reshaping Wisconsin's threat landscape. From the Patient Protect publication.
May 25, 2026 · Breach
Radiology Associates of Richmond disclosed a data breach affecting 266,000 individuals after threat actors exfiltrated files containing names and protected health information from its systems.
Read on HIPAA Pulse
May 22, 2026 · Breach
Radiology Associates of Richmond disclosed a second data breach in under two years, with the latest incident affecting 266,000 patients and reported to Maine's Attorney General in May 2026.
Read on HIPAA Pulse
May 22, 2026 · Breach
Verizon's 2026 Data Breach Investigations Report finds healthcare facing a sharper threat from social engineering while ransomware and third-party vendor compromises continue to drive significant breach volume across the sector.
Read on HIPAA Pulse
May 18, 2026 · Breach
A healthcare software vendor serving the congressional physician's office was breached in early March, exposing prescription data — but lawmakers were not notified until more than two months after the intrusion.
Read on HIPAA Pulse
May 16, 2026 · Litigation
A federal jury in Michigan convicted a home health care agency owner and nurse of running a $1.6 million Medicare fraud scheme built on stolen patient records from 2018 to 2021.
Read on HIPAA Pulse
May 13, 2026 · Breach
OpenLoop Health, a telehealth platform serving independent practices and health systems, disclosed a January 2025 breach that exposed personal data belonging to roughly 716,000 individuals.
Read on HIPAA Pulse
HIPAA Pulse is the editorial publication of Patient Protect. PP’s HIPAA Response translates each story into operational guidance.
