Breach filing
ArchivedWolverine Solutions Group: 1,024,731 individuals, Dec 2018.
Wolverine Solutions Group reported a breach of unsecured protected health information to the HHS Office for Civil Rights on 28 December 2018. The filing records the organisation as a business associate in Michigan and lists 1,024,731 individuals affected, which makes it the 4th largest of the 238 Michigan filings on the register and the 4th largest of the 369 filings submitted nationally in 2018. Among the 11 Michigan filings made in 2018 it ranks 1st.
Individuals affected
1,024,731
As reported to HHS
Modelled cost (IBM 2025)
$164M
Upper bound, method shown
Rank in MI
4th
of 238 Michigan filings
Rank in 2018
4th
of 369 filings nationally
Section F.1 / The filing
As posted by HHS OCR
Every value below is the portal's own field for this filing, plus its rank within the register.
- Covered entity type
- Business Associate
- Individuals affected
- 1,024,731
- Breach submission date
- 28 December 2018
- Submission year
- 2018
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- Yes
- State
- Michigan (MI)
- Portal status
- listed in the HHS OCR breach portal archive
- Rank in Michigan by size
- 4th of 238
- Rank in 2018 nationally
- 4th of 369
- Michigan median filing
- 3,754 individuals
- Register id (derived)
- MI-20181228-wolverine-solutions-group
Section F.2 / In context
Where this filing sits in Michigan and in 2018
OCR classifies the incident as a hacking or IT incident, with the breached information held in a network server. Hacking/IT Incident is the type recorded on 148 of the 238 Michigan filings (62%) and on 45% of all filings submitted in 2018. Network Server appears on 45% of Michigan filings.
A business associate is recorded as present on the filing, as it is on 30% of Michigan filings. At 1,024,731 individuals the breach is 273 times the Michigan median filing of 3,754 and 256 times the national median of 4,000 across all 7,884 filings. It is one of 149 filings on the register of one million or more individuals.
As of 28 August 2026 the case is listed in the HHS OCR breach portal archive. OCR's closing summary of the case is reproduced in full below.
Michigan's breach notification statute (MCL 445.72) requires notice to affected residents without unreasonable delay. Its attorney general threshold: not currently required (pending SB 360 would require it at 100+ residents). The HIPAA Breach Notification Rule ran alongside it: notice to affected individuals and to HHS without unreasonable delay and no later than 60 days after discovery, which is the clock that put this filing on the portal.
Multiplying 1,024,731 individuals by IBM's $160 customer-PII cost per record (Cost of a Data Breach 2025, the figure the site's calculator uses) gives a modelled $164M; the 2026 edition's $192 gives $197M. Both are modelled estimates with the method shown, not costs disclosed by Wolverine Solutions Group. Because the filing is above the roughly 100,000-record range in which the per-record figure is reliable, the result is an upper bound, not an estimate: fixed costs are spread across far more records at this scale.
Section F.3 / OCR closing summary
The portal's archived description, in full
Written by the Office for Civil Rights when the case was closed and reproduced verbatim from the HHS export.
The business associate (BA), Wolverine Solutions Group, reported that it was the victim of a ransomware attack affecting the protected health information (PHI) of 1,024,731 individuals. The PHI involved included names, addresses, dates of birth, drivers' license numbers, Social Security numbers, health insurance information, claims information, diagnoses, lab results, and medications. The BA notified HHS, affected individuals, the media, and provided substitute notice. In response to the breach, the BA offered complimentary credit monitoring services to affected individuals, and implemented additional administrative, technical and security safeguards.
Section F.5 / Modelled cost
1,024,731 individuals through IBM's per-record figures
Modelled cost / method shown, not a disclosed cost
Upper boundIBM 2025 customer PII, $160 per record
$164M
1,024,731 x $160
IBM 2026 customer PII, $192 per record
$197M
1,024,731 x $192
Method: individuals affected, as reported by Wolverine Solutions Group to HHS, multiplied by IBM's customer-PII cost per record (Cost of a Data Breach 2025 Figure 6 and the 2026 edition). No cost has been disclosed by the entity for this filing; the figure is a planning estimate, not a fact about the breach. IBM's per-record figures come from mid-volume breaches and IBM cautions against applying them to breaches involving millions of records; the site's per-record page explains where the multiplication holds and where it breaks down.
Context: IBM's average cost of a healthcare breach is $6.64M in the 2026 report ($7.42M in 2025); the global average across all sectors was $4.44M in 2025.
Cost per record: method and limits / Healthcare breach cost, IBM 2026
Section F.6 / Notification clock
Michigan statute and the HIPAA rule
State notification statute
Michigan: MCL 445.72
Identity Theft Protection Act
- Notice to individuals
- Without unreasonable delay
- Attorney general threshold
- Not currently required (pending SB 360 would require it at 100+ residents)
- Private right of action
- No: No PROA under the statute; other theories such as negligence may apply
- Penalty
- Up to $250 per failed notification, capped at $750,000 per breach event
The HIPAA Breach Notification Rule runs alongside the state statute: notice to affected individuals and to HHS without unreasonable delay and no later than 60 days after discovery.
Section F.7 / Peer filings
Michigan filings closest in size
Neighbours by size rank among Michigan filings in 2018, topped up from other years where 2018 has too few. Filings of 10,000 or more link to their own page.
| Covered entity | Type | Individuals | Submitted | Breach type | Location | BA |
|---|---|---|---|---|---|---|
| McLaren Health Care | Healthcare Provider | 2,103,881 | 20 Oct 2023 | |||
| Great Expressions Dental Centers | Healthcare Provider | 1,925,397 | 12 May 2023 | |||
| Wright & Filippis LLC | Healthcare Provider | 877,584 | 18 Nov 2022 | |||
| Holland Eye Surgery and Laser Center | Healthcare Provider | 42,200 | 18 May 2018 | |||
| InfuSystem, Inc. | Healthcare Provider | 3,882 | 22 Jun 2018 |
Index / Companion schedules
13 HHS breach register
→Hub: every filing, by state, year and entity.
04 Biggest breaches
→Mega-breaches with primary-source cost figures.
Industry / Healthcare
→IBM 2026: $6.64M average, 13 years at #1.
Regulation / HIPAA penalties
→OCR enforcement tiers and the 60-day rule.
11 50-state laws
→Deadline, AG threshold and penalties per state.
Cost / Per record
→Where the per-record model is reliable.
Provenance
Source: U.S. Department of Health and Human Services, Office for Civil Rights, Breach Portal (breaches affecting 500 or more individuals), retrieved 2026-08-28. Public domain. Individuals affected and dates as reported by the covered entity.
Portal: ocrportal.hhs.gov breach report. Statutory basis: HITECH Act section 13402(e)(4): the Secretary must post a list of breaches of unsecured protected health information affecting 500 or more individuals. Breaches affecting fewer than 500 individuals are reported to OCR annually and are not posted, so they are not on this register. Status wording follows the portal's two tabs ("Cases Currently Under Investigation" and "Archive") as of 28 August 2026; a filing moves to the archive when OCR closes the case. Modelled costs on this site are a method applied to the reported count, using IBM Cost of a Data Breach per-record figures, and are never a cost disclosed by the entity. This row: hhs-breach-archive__2026-08-28.csv, export row 4629.
Corrections: if you represent a listed entity and the portal row has been amended, email [email protected] with the portal entry and we will re-pull the export.