Cornerstone Municipal Advisory Group
Disclosed Apr 2, 20215 years ago9,202 affectedConfirmed
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 affected | 9,202 (as reported to HHS) |
|---|---|
| Disclosed | Apr 2, 2021 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| HHS OCR breach report (archive, resolved): Cornerstone Municipal Advisory Group (Business Associate, MI)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Apr 2, 2021 | 9,202 |
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.