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HHS OCR report ยท 2021

Cornerstone Municipal Advisory Group LLC dba Manquen Vance data breach

Cornerstone Municipal Advisory Group LLC dba Manquen Vance, a business associate in Michigan, reported a breach affecting 9,202 individuals to HHS OCR on Apr 2, 2021.

OCR report facts

Covered entity
Cornerstone Municipal Advisory Group LLC dba Manquen Vance
Entity type
Business Associate
State
Michigan
Individuals affected
9,202
Submission date
Apr 2, 2021
Type of breach
Hacking/IT Incident
Location of breached information
Email
Business associate present
Yes
Status
Archive (closed)

OCR description

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....

Text as published on the HHS OCR breach portal.

Frequently asked questions

How many people were affected by the Cornerstone Municipal Advisory Group LLC dba Manquen Vance data breach?

The report to HHS OCR lists 9,202 individuals affected.

When was it reported to HHS?

It was submitted to HHS OCR on Apr 2, 2021.

What type of breach was it?

The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Email.

Is the investigation still open?

No. The report is in the OCR portal archive, which holds reports where OCR has closed its review.

Is a breach notice letter from Cornerstone Municipal Advisory Group LLC dba Manquen Vance legitimate?

This site cannot verify letters. Check the sender against the organisation's official website and the HHS OCR breach portal, and avoid calling numbers or clicking links only listed in an unexpected message. See our guide on what to do after a data breach notice.

Source: HHS OCR Breach Portal, OCR export October 2026. Network USA is not affiliated with HHS or Cornerstone Municipal Advisory Group LLC dba Manquen Vance.