Corewell Health patients affected by 2024 data breach at Pinnacle Holdings
Corewell Health patients were recently notified (April 3, 2026) about a data breach that occurred in late 2024 at healthcare consulting firm Pinnacle Holdings, LTD.
Key points
- Third-party breach at healthcare consulting firm Pinnacle Holdings, LTD.
- Incident occurred late 2024; patients notified April 3, 2026.
- Approximately 19,000 patients affected.
Connected intelligence
Signal brief
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Organization
- Published
- Apr 3, 2026
- Updated
- Jun 26, 2026
- Confidence
- Medium
- Evidence
- 2 sources
Structured assessment
Signal analysis
This analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Threat source
Watch exposure paths that could affect data, operations or third-party trust.
Business impact
- Impact area
- Confidentiality
- Likely asset
- User or customer data
Mentioned entities
Quick context
Questions about this signal
What happened in this signal?
Corewell Health patients were recently notified (April 3, 2026) about a data breach that occurred in late 2024 at healthcare consulting firm Pinnacle Holdings, LTD. Approximately 19,000 patients were affected, with personal details including name, contact information, birth dates, Social Security Numbers, and government-issued ID numbers being compromised.
When was this signal reported?
Shadow Tier lists Apr 3, 2026 as the signal date.
Which organization is connected to this signal?
Corewellhealth is the organization connected to this public signal.
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