HackingHealthcareHealthcareSupply Chain (3P Vendor)Customer Data InvolvedPHIGovernment IDIdentity (basic)Health (basic)MediumContained

Petaluma Health Center

bd_9de0745dc22742d0 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 15, 2025

Filed

Jan 20, 2026

To disclose

5 weeks

Affected

Not disclosed

Confidence

66%

Full breach record for Petaluma Health Center →2 incidents on file

Petaluma Health Center notified patients of a data breach involving a third-party vendor, TriZetto, which works with their electronic medical record system (OCHIN). An unauthorized individual gained access to TriZetto's systems. Affected data may include names, social security numbers, dates of birth, contact information, and health/insurance information. The clinic was notified by OCHIN on December 15, 2025. TriZetto engaged Kroll for notification and identity theft protection services.

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Incident timeline

discovery → filing · 5 weeks / 36 days

Dec 15, 2025

Discovered

Jan 20, 2026

Filed

vs. sector median

7 wks faster

Part of TriZetto Provider Solutions supply-chain incident (2025) — a supply-chain cascade affecting multiple organizations.View cascade →

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Petaluma Health Center
norm: petaluma health center

Name: Petaluma Health Center
norm: petaluma health center
Industry: Healthcarellm

Discovered: Dec 15, 2025
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PHIGovernment IDIdentity (basic)Health (basic)
Data elements: Social Security numberDate of birthMedical information
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain Compromise
Threat actor: External
Third party: via TriZetto
Initial access: supply_chain

During the incident: Working closely with OCHIN to understand what happened and ensure protection of patient information
Reviewing our own processes to reduce the risk of something like this happening again
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(36 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://oag.ca.gov/ecrime/databreach/reports/sb24-617350
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 20, 2026
Raw hash: bf3c85808a570521d357e38789da75567ab3049728d72bef2e3b29db63071006

Reporting entityPetaluma Health Center

Victim entityPetaluma Health Center

Incidentdiscovered Dec 15, 2025

Stated responseWorking closely with OCHIN to understand what happened and ensure protection of patient information

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov