CALIFORNIAMalwareHealthcareHealthcareRansomwareData EncryptedRansom DemandedData ExfiltratedCustomer Data InvolvedSupply Chain (3P Vendor)PHIHealth (basic)Government IDIdentity (basic)Financial accountCriticalContained

Prospect Medical Holdings, Inc.

bd_2fef4c679272ccd3 · schema v1 · pii pii-v1

Severity

Critical

Discovered

—

Filed

Sep 29, 2023

To disclose

—

Affected

1,309,096

Linked

13 filings

Confidence

69%

Full breach record for Prospect Medical Holdings, Inc. →

Prospect Medical Holdings, Inc. reported a ransomware incident affecting 1,309,096 individuals' PHI, including names, SSNs, DOBs, and medical data. The CE offered credit monitoring and implemented safeguards.

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Leak gap clock⏱ Leak >30d

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

⚠ No discovery dateThe OCR public portal omits the discovery date, so the 60-day notification clock cannot be evaluated from this source — only that the filing was submitted.

Incident timeline — partial

? — ?

Breach window unknown

Sep 29, 2023

Filed

—

Corroborated · see linked filings

Compliance clocks stay unassessable until a regulatory filing lands. Dashed segments fill in automatically when corroboration arrives.

This filing is one of 13 about the same incident.View merged incident

A leak claim by rhysida about this victim predates this filing by 36 days.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

Indiana State AGbd_01179efaed3e75352023-09-29Verified
New Hampshire State AGbd_35efeda2e5a8d88f2023-09-29Verified
Maine State AGbd_6ef44d457fd8b2602023-09-29Verified
Vermont State AGbd_91573382e8c024192023-09-29Verified

Show 6 more filings ↓up to 154d gap

California State AGbd_bd24866d0fea52f92023-09-29Verified
Massachusetts State AGbd_c20d4bad3ff6d87f2023-09-29Verified
Montana State AGbd_f1bc0b4d5ad05a502023-09-29Verified
California State AGbd_e78b914f634463f72023-12-13 · +75dVerified
New Hampshire State AGbd_610b4d3b2e537df72024-02-29 · +153dVerified
Massachusetts State AGbd_e9100cb92bc339de2024-03-01 · +154dVerified

Showing first 10 of 12 linked disclosures.

Name: Prospect Medical Holdings, Inc.
norm: prospect medical
Domain: pmh.com

Name: Prospect Medical Holdings, Inc.
norm: prospect medical
Domain: pmh.com
Industry: Healthcaresource default

Discovered: Not extracted — the OCR public portal omits it
Materiality determined: —
Notification sent: —
Affected individuals: 1,309,096
Data types: PHIHealth (basic)Government IDIdentity (basic)Financial account
HHS breach type: Hacking / IT incident
Where the data lived: Network server
Covered-entity type: Business associate
Attack vector: Ransomware
MITRE ATT&CK: T1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: notified HHS

During the incident: Offered free credit monitoring and identity theft protection services
Implemented new administrative and technical safeguards
Notified HHS, affected individuals, the media, and posted substitute notice on its website
Changes made: Implemented new administrative and technical safeguards
Source: Quoted from the filing itself, not independently verified.

Compliance flags: Leak >30dHHS notified
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.
Clock breakdown: Statute Window Elapsed Threshold Status
HIPAA
Discovered: not extracted
→ Notified: not extracted
— regulatory submission HHS notified

Statute	Window	Elapsed	Threshold	Status
HIPAA	Discovered: not extracted → Notified: not extracted	—	regulatory submission	HHS notified

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 7 states

View merged incident ↗

Indiana State AGSep 29 · first

New Hampshire State AGSep 29 · first

Maine State AGSep 29 · first

Vermont State AGSep 29 · first

California State AGSep 29 · first

Massachusetts State AGSep 29 · first

Montana State AGSep 29 · first

HHS OCRSep 29 · first · this page

California State AG+75d

New Hampshire State AG+153d

Massachusetts State AG+154d

Pattern: first filing Sep 29 (IN), last Mar 1 (MA) — a 154-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 12 — the full spread may be wider.

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://ocrportal.hhs.gov/ocr/breach/breach_report.jsf
DisclosureLens renders the full SEC/HHS filing inline below from the originating regulator’s public record (§4.5 fair report privilege).
Filed at: Sep 29, 2023
Raw hash: 2385a0655afe248cce0328557385af1435ca97599bbbe31ca57935075fe6d10d

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Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityProspect Medical Holdings, Inc.

Victim entityProspect Medical Holdings, Inc.

IncidentRansomware

Stated responseOffered free credit monitoring and identity theft protection services

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenanceocrportal.hhs.gov

Source filing