Longleaf Network Reports Major Data Exposure in Maryland

The Longleaf Network, LLC, a Maryland-based healthcare technology company, reported a data security incident on March 3, 2025, to the state's Attorney General. This breach exposed sensitive personal and medical data, including Social Security Numbers and Diagnosis and Treatment Information. Individuals affected are advised to monitor their financial and medical accounts for unusual activity.

State: Maryland
Reported: March 3, 2025

What may have been exposed

Full Name
Date of Birth
Social Security Number
Medical Record Number
Health Insurance ID Number
Diagnosis and Treatment Information
Prescription Information
Provider and Treatment Dates

On March 3, 2025, The Longleaf Network, LLC, operating out of Maryland, formally reported a data security incident to the Maryland Attorney General's office. The Longleaf Network serves as a key intermediary for regional medical providers, insurance administrators, and patients within the healthcare technology and administrative support sector. The specific type of breach remains unspecified, with ongoing forensic investigations to determine the full scope.

The reported exposure from this incident includes a combination of highly sensitive information: Full Name, Date of Birth, Social Security Number, Medical Record Number, Health Insurance ID Number, Diagnosis and Treatment Information, Prescription Information, and Provider and Treatment Dates. The compromise of these data types, particularly immutable identifiers like Social Security Numbers and detailed medical records, poses significant risks to affected individuals. Unlike credit card numbers, this information cannot be easily changed or replaced.

Such sensitive data can be exploited for medical identity theft, fraudulent insurance claims, and unauthorized acquisition of prescriptions. The permanent nature of much of the exposed data means that affected individuals may face long-term risks of targeted fraud.

As an entity handling protected health information, The Longleaf Network, LLC is subject to federal and state regulations, including the Health Insurance Portability and Accountability Act (HIPAA) Security and Privacy Rules. These frameworks mandate the implementation of robust safeguards to protect confidential records. The occurrence of a data breach suggests that certain security protocols may have been compromised or were insufficient.

Individuals who receive a formal data breach notification from The Longleaf Network, LLC should carefully review the information provided. It is recommended to promptly review all Explanation of Benefits (EOB) statements from insurers, medical bills, and credit reports for any unfamiliar or suspicious activity. Placing a fraud alert or credit freeze on credit files can also provide additional protection against financial identity theft.

What to do if you were affected

Based on the categories of information reported in this filing, these steps can help limit the risk of identity theft and fraud.

Freeze your credit
Place a free credit freeze with Equifax, Experian, and TransUnion. A freeze blocks new accounts from being opened in your name and can be lifted anytime.
Check for medical identity theft
Review the Explanation of Benefits statements from your health insurer for services or claims you never received, which can signal misuse of your medical identity.
Stay alert to targeted scams
Be cautious of calls, texts, or emails that reference this breach. Legitimate organizations won't ask you to confirm sensitive details through an unsolicited message.
Keep your notification letter
Save the notice you received. It documents that your information was involved and is often needed to enroll in any credit monitoring offered or to join a related legal claim.

Source: Maryland Attorney General filing

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