MalwareHealthcareHealthcareRansomwareData ExfiltratedData EncryptedCustomer Data InvolvedIdentity (basic)Government IDMediumContained

Columbia Medical Practice

bd_0d3025706b44e21b · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 5, 2025

Filed

Apr 24, 2026

To disclose

24 weeks

Affected

6state residents only

Linked

4 filings

Confidence

66%

Full breach record for Columbia Medical Practice →3 incidents on file

Columbia Medical Practice, a healthcare provider, disclosed a ransomware incident on November 5, 2025, where an external actor encrypted files and exfiltrated data. The breach affected 6 Maine residents, exposing names and Social Security numbers. Notices were sent on April 24, 2026, offering 12 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Nov 5, 2025 → Filed with AG Apr 24, 2026170d ✗ ME AG >90d24 weeks discovery → filing

⚠ occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.

Incident timeline

discovery → filing · 24 weeks / 170 days

Nov 5, 2025

Begins

Nov 5, 2025

Discovered

Apr 24, 2026

Filed

vs. sector median

+12 wks slower

This filing is one of 4 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

New Hampshire State AGbd_35449517a60b440a2026-04-24Verified by operator
Massachusetts State AGbd_356fb379ec1b38802026-04-24Verified by operator
HHS OCRbd_052a3d4befc213552025-12-05 · +140dVerified

Name: Columbia Medical Practice
norm: columbia medical practice
Domain: cmpractice.com

Name: Columbia Medical Practice
norm: columbia medical practice
Domain: cmpractice.com
Industry: Healthcarellm

Discovered: Nov 5, 2025
Breach occurred: Nov 5, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 24, 2026
Affected individuals: 6state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1486 Data Encrypted for ImpactT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Notified the U.S. Department of Health and Human ServicesNotified federal law enforcement

During the incident: Engaged cybersecurity specialists
Notified federal law enforcement
Notified the U.S. Department of Health and Human Services
Published notice on its website
Provided access to credit monitoring and identity restoration services for one year through TransUnion
Changes made: Implemented additional safeguards and training to its employees
Implemented additional technical measures and processes to further enhance the security of its systems
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 24 weeks(170 days from discovery to filing)
Compliance flags: ME AG >90d · 170dME resident >60d · 170dLeak >90d
Discovery-date grounding: occurrence dateThe stored discovery date equals the breach OCCURRENCE date. Detection is normally later, so this OVERSTATES the delay — a 'late' verdict here may not be real.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Nov 5, 2025
→ Filed with AG: Apr 24, 2026
170d 90 days ME AG >90d
Maine
Discovered: Nov 5, 2025
→ Notified: Apr 24, 2026
170d 60 days (analyst band; statutory cap is 30 days) ME resident >60d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Nov 5, 2025 → Filed with AG: Apr 24, 2026	170d	90 days	ME AG >90d
Maine	Discovered: Nov 5, 2025 → Notified: Apr 24, 2026	170d	60 days (analyst band; statutory cap is 30 days)	ME resident >60d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

HHS OCRDec 5 · first

New Hampshire State AG+140d

Massachusetts State AG+140d

Maine State AG+140d · this page

Pattern: first filing Dec 5 (MD), last Apr 24 (ME) — a 140-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/78eb57c4-a3d1-4ab8-95de-385f536c0e3c.html
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 24, 2026
Raw hash: b006781fe5e957d9ce04b01874dd720db1d7b0ca89d35c2c34a293e3c852e6b1

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityColumbia Medical Practice

Victim entityColumbia Medical Practice

Incidentdiscovered Nov 5, 2025

Stated responseEngaged cybersecurity specialists

ComplianceME AG >90d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov