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47 disclosed this week · 26,367 on record

Missouri Dept. of Mental Health

Disclosed Feb 21, 20181,000 affectedConfirmed

Official notice

The covered entity (CE), Missouri Dept. of Mental Health, erroneously mailed letters to family members of individuals receiving services, affecting 1,000 individuals. The protected health information (PHI) involved in the breach included consumers' names. Following the breach, the CE implemented additional safeguarding and quality control procedures for mailings. The CE provided notice of the breach to affected individuals, the media, and to HHS. As a result of OCR’s investigation, the CE updated its Breach Rule Notification policy, specifically to include information about reporting breaches that affected under 500 individuals. OCR obtained documented assurances that the CE implemented the corrective actions listed above.

What is known

People affected1,000 (as reported to HHS)
DisclosedFeb 21, 2018
AttackInsider
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

History of this record
Added2026-09-25
First recordedby backfillSource

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

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