Quantum Health Data Breach Exposes Sensitive Patient Information in 2026 Incident
Quantum Health Inc., a healthcare navigation and care coordination provider based in Dublin, Ohio, disclosed a data breach involving unauthorized access to its IT network in late May 2026. The incident began on May 29, 2026, when an attacker gained entry through a fraudulent call to a company user, allowing access to internal systems. Between May 29 and June 1, the unauthorized party exfiltrated files before Quantum Health detected a service outage on June 1, prompting an investigation that linked the disruption to the breach.
By July 8, 2026, the company confirmed that the stolen files contained personally identifiable information (PII) and protected health information (PHI) of affected individuals. Exposed data included names, Social Security numbers, dates of birth, contact details, medical records, treatment histories, insurance policy numbers, and claims information.
Quantum Health reported the breach to the Massachusetts Office of Consumer Affairs and Business Regulation and began notifying impacted individuals via mail. As part of its response, the company is offering complimentary identity monitoring services through Kroll, with affected parties required to enroll by a specified deadline using details provided in their notification letters. A dedicated call center has been established for inquiries.
Source: https://www.claimdepot.com/data-breach/quantum-health-2026
Quantum Health cybersecurity rating report: https://www.rankiteo.com/company/quantum-health
"id": "QUA1785465704",
"linkid": "quantum-health",
"type": "Breach",
"date": "5/2026",
"severity": "85",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'industry': 'Healthcare',
'location': 'Dublin, Ohio, USA',
'name': 'Quantum Health Inc.',
'type': 'Healthcare Navigation and Care Coordination '
'Provider'}],
'attack_vector': 'Social Engineering (Fraudulent Call)',
'customer_advisories': 'Notification letters with enrollment details for '
'identity monitoring services',
'data_breach': {'data_exfiltration': True,
'personally_identifiable_information': ['Names',
'Social Security '
'numbers',
'Dates of birth',
'Contact details',
'Medical records',
'Treatment histories',
'Insurance policy '
'numbers',
'Claims information'],
'sensitivity_of_data': 'High',
'type_of_data_compromised': ['Personally Identifiable '
'Information (PII)',
'Protected Health Information '
'(PHI)']},
'date_detected': '2026-06-01',
'date_publicly_disclosed': '2026-07-08',
'description': 'Quantum Health Inc. disclosed a data breach involving '
'unauthorized access to its IT network in late May 2026. The '
'incident began on May 29, 2026, when an attacker gained entry '
'through a fraudulent call to a company user, allowing access '
'to internal systems. Between May 29 and June 1, the '
'unauthorized party exfiltrated files before Quantum Health '
'detected a service outage on June 1, prompting an '
'investigation that linked the disruption to the breach. '
'Exposed data included personally identifiable information '
'(PII) and protected health information (PHI) such as names, '
'Social Security numbers, dates of birth, contact details, '
'medical records, treatment histories, insurance policy '
'numbers, and claims information.',
'impact': {'data_compromised': 'Personally identifiable information (PII) and '
'protected health information (PHI)',
'identity_theft_risk': 'High',
'operational_impact': 'Service outage',
'systems_affected': 'IT network'},
'initial_access_broker': {'entry_point': 'Fraudulent call to a company user'},
'investigation_status': 'Ongoing',
'references': [{'source': 'Massachusetts Office of Consumer Affairs and '
'Business Regulation'}],
'regulatory_compliance': {'regulatory_notifications': ['Massachusetts Office '
'of Consumer Affairs '
'and Business '
'Regulation']},
'response': {'communication_strategy': 'Notification letters to affected '
'individuals, dedicated call center',
'third_party_assistance': 'Kroll (Identity Monitoring Services)'},
'title': 'Quantum Health Data Breach Exposes Sensitive Patient Information',
'type': 'Data Breach'}