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Cornerstone Municipal Advisory Group

Disclosed Apr 2, 20215 years ago9,202 affectedConfirmed

Official notice

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.

What is known

People affected9,202 (as reported to HHS)
DisclosedApr 2, 2021
AttackHacking
Data exposedNames, Health
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

WhereFiledPeople
HHS archivetotalApr 2, 20219,202
History of this record
  • 2026-09-25 · added · backfill source

First seen 2026-09-25 (HHS archive), confirmed by HHS OCR. Record counts are as reported. Not legal advice.

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