AccidentalHealthcareFinancial ServicesHealthcareMisdeliveryCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDPHIHealth (basic)MediumContained

NTT

bd_96508b684cdc2ac6 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Dec 29, 2025

Filed

Feb 12, 2026

To disclose

6 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

66%

Full breach record for NTT →

NTT Health Plan notified consumers of a data breach involving a third-party business associate, Quantum Health. Between Dec 15-29, 2025, a claims report containing PII and PHI (names, SSNs, member IDs, claim info) was inadvertently shared with another plan member. No evidence of misuse was found. Remediation included securing data, deleting the report, and offering 24 months of Experian IdentityWorks.

J jump to incidentP pin to compareR raw source

Vermont clock⏱ VT AG >14 bday6 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 14 days

discovery → filing · 6 weeks / 45 days

Dec 15, 2025

Begins

Dec 29, 2025

Discovered

Feb 12, 2026

Filed

vs. sector median

6 wks faster

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_b47d9ba6866798882026-02-18 · +6dVerified

Name: NTT
norm: ntt
Domain: group.ntt

Name: NTT
norm: ntt
Domain: group.ntt
Industry: HealthcarellmFinancial Servicesllm

Discovered: Dec 29, 2025
Breach occurred: Dec 15, 2025 – Dec 29, 2025
Undetected for: 14 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 12, 2026
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDPHIHealth (basic)
Data elements: Social Security number
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain Compromise
Threat actor: Partner
Third party: via Quantum Health

During the incident: Quantum Health took immediate steps to secure the information
Began an investigation
Quantum Health confirmed with the recipient that the report was deleted
Offering complimentary access to Experian IdentityWorks for 24 months
Changes made: Implemented additional administrative, technical, and other safeguards
Enhanced training
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 6 weeks(45 days from discovery to filing)
Compliance flags: VT AG >14 bday
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Vermont State AGFeb 12 · first · this page

Massachusetts State AG+6d

Pattern: first filing Feb 12 (VT), last Feb 18 (MA) — a 6-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://ago.vermont.gov/document/2026-02-12-ntt-data-data-breach-notice-consumers
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 12, 2026
Raw hash: 0429b0f9dec9abcf12b5fc1521dd082534d432f2256e6894c231da11b633be3c

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityNTT

Victim entityNTT

Incidentdiscovered Dec 29, 2025

Stated responseQuantum Health took immediate steps to secure the information

ComplianceVT AG >14 bday

Extraction provenanceno artifact recorded

Source provenanceago.vermont.gov