Denton County MHMR Center Data Breach Affects 109,000 Patients
Denton County MHMR Center, a community behavioral health clinic in Denton, Texas, recently reported a major data breach to the Department of Health and Human Services’ Office for Civil Rights (OCR) that involved unauthorized access to the protected health information of 108,967 current and former patients. Unusual activity was identified within its computer network on or around December 24, 2024, with the investigation confirming that an unauthorized third party had access to its network from December 24 to December 25, 2024.
Denton County MHMR Center uploaded a substitute breach notice to its website on February 21, 2025, alerting patients about the incident, although at the time, the investigation and data review were ongoing, and it had yet to be determined how many individuals had been affected and the exact data types involved. On October 10, 2025, Denton County MHMR Center confirmed that the information potentially compromised in the incident included patient names, addresses, patients’ identification numbers, dates of birth, diagnosis, medical history information, medical record numbers, medical treatment information, lab information, treating doctor’s name, medication information, vaccination information, medical insurance information, and biometric identifiers.
On November 5, 2025, the data breach was reported to the HHS’ Office for Civil Rights, and state Attorneys general have now been notified. A year after the breach occurred, the affected individuals are receiving individual notification letters. At the time of issuing the letters, Denton County MHMR Center was unaware of any misuse of the exposed patient data.
Denton County MHMR Center updated its website breach notice on December 30, 2025, confirming that credit monitoring and identity protection services have been offered to the affected individuals. Denton County MHMR Center has worked with third-party cybersecurity experts to implement additional measures to improve network security, and its policies and procedures related to data protection have been reviewed and enhanced.
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