HackingHealthcareHealthcareDelayed DiscoveryCustomer Data InvolvedIdentity (basic)Government IDHealth (basic)PHIMediumContained

Medical Oncology Hematology Consultants, P.A.

bd_996ebc1f9fbd4c3c · schema v1 · pii pii-v1

Severity

Medium

Discovered

Feb 12, 2026

Filed

Apr 30, 2026

To disclose

11 weeks

Affected

2state residents only

Linked

5 filings

Confidence

66%

Full breach record for Medical Oncology Hematology Consultants, P.A. →3 incidents on file

Hematology Oncology Consultants (HOC), a Michigan healthcare provider, notified the New Hampshire Attorney General of a data event affecting 2 NH residents. Unauthorized access occurred on the network around September 20, 2025, but was discovered on February 12, 2026. Affected data included names, SSNs, and PHI. HOC engaged cyber specialists, enhanced network security, and offered 12 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Leak gap clock✗ Leak >180d11 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 · 145 days

discovery → filing · 11 weeks / 77 days

Sep 20, 2025

Begins

Feb 12, 2026

Discovered

Apr 30, 2026

Filed

vs. sector median

2 wks faster

This filing is one of 5 about the same incident.View merged incident

A leak claim by rhysida about this victim predates this filing by 222 days.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (2)

Leak Siterhysidabd_48da52597f13bd152025-10-17 · +194dVerified by operator
Leak Siterhysidabd_46e41800cd5f36a82025-09-20 · +222dVerified by operator

Regulatory filings (2) · sorted by filing gap

Massachusetts State AGbd_d8e6325f69d84a822026-05-01 · +1dVerified by operator
HHS OCRbd_2e0638d56653ed152026-04-24 · +6dVerified by operator

Name: Constangy, Brooks, Smith & Prophete, LLP
norm: constangy brooks smith prophete

Name: Medical Oncology Hematology Consultants, P.A.
norm: medical oncology hematology consultants
Industry: Healthcarellm

Discovered: Feb 12, 2026
Breach occurred: Sep 20, 2025
Undetected for: 145 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 24, 2026
Affected individuals: 2state-resident count only
Data types: Identity (basic)Government IDHealth (basic)PHI
Data elements: Social Security numberMedical information
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Attorney GeneralNotified three major credit reporting agencies (Equifax, Experian, TransUnion)

During the incident: Took steps to secure the digital environment
Contain the incident
Investigate with the assistance of cyber specialists
Conducted a prompt and comprehensive investigation to confirm the scope of the event
Established a toll-free call center to answer questions
Providing written notice of this incident to relevant state and federal regulators
Providing written notice... to the three major credit reporting agencies, Equifax, Experian, and TransUnion
Changes made: Taken additional steps to enhance the security of its network
Review policies and procedures to implement additional measures
Implemented additional measures to further harden our environment
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 11 weeks(77 days from discovery to filing)
Compliance flags: Leak >180d
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 · 3 filings · 3 states

View merged incident ↗

HHS OCRApr 24 · first

New Hampshire State AG+6d · this page

Massachusetts State AG+7d

Pattern: first filing Apr 24 (MI), last May 1 (MA) — a 7-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://mm.nh.gov/files/uploads/doj/remote-docs/hematology-oncology-consultants-20260430.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 30, 2026
Raw hash: a9c1df81ae7862a237afc62576354c8a7024768bf98b9126864054e5161cc189

Linked disclosures

Ransomware claims (2)

Regulatory filings (2) · sorted by filing gap

Reporting entityConstangy, Brooks, Smith & Prophete, LLP

Victim entityMedical Oncology Hematology Consultants, P.A.

Incidentdiscovered Feb 12, 2026

Stated responseTook steps to secure the digital environment

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov