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Regulator-posted notice

Breach notice filed by Cornerstone Municipal Advisory Group LLC dba Manquen Vance (April 2021)

Organization named: Cornerstone Municipal Advisory Group LLC dba Manquen Vance Provisional: identity as filed, not yet matched to the directory
Type as the source lists it: Hacking/IT Incident

What the sources say

HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals) Primary notice

Posted on the HHS Office for Civil Rights breach portal with a submission date of April 2, 2021.

Organization as reported
Cornerstone Municipal Advisory Group LLC dba Manquen Vance, MI
Entity type as reported
Business Associate
Category as reported
Hacking/IT Incident
Location of information as reported
Email
Submission date
April 2, 2021
Observed by BreachRecords
2026-10-18 16:15 UTC (revision 12246, row:3385)
Archived copy
Held in the private archive (provenance)

Cornerstone Municipal Advisory Group dba Manquen Vance, the business associate (BA), reported that an employee was the subject of an email phishing scheme that affected the protected health information (PHI) of 9,202 individuals. The PHI involved included names, addresses, birthdates, Social Security numbers, claims information, diagnoses, lab results, medications prescribed, and other treatment information. The BA notified HHS, affected individuals, the media, and provided substitute notice. In response to the breach, the BA provided complimentary credit monitoring services and implemented additional administrative, technical, and security safeguards to better protect its PHI. OCR provided the BA with technical assistance regarding its HIPAA Security Rule obligations.

The source's own words, from the revision above.

Figures, per source

  • 9,202 individuals affected (total reported), according to the HHS Office for Civil Rights breach portal, source date April 2, 2021, revision observed 2026-10-18.

Each figure is one source's figure with the basis that source gave. Figures from different sources are shown side by side and are not added, averaged or chosen between.

Timeline

Source dates are the dates the sources give. Observation dates are when BreachRecords recorded each revision.

  • Submission date (HHS Office for Civil Rights breach portal)
  • Observed by BreachRecords (revision 12246)
  • Approved by a reviewer

Organizations linked by a reviewer

Archived evidence

  • 3dbc27dd5742e041cc1e7fe18cc669e2901fbd3b86b7007ed27948ff4d406e1f
    text/csv, 5,530,996 bytes, retrieved from HHS Office for Civil Rights breach portal, 2026-10-18 16:15 UTC. Archived privately · Provenance · Source page

Records reflect source filings as of the dates shown. BreachRecords is not a regulator.

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