The covered entity (CE), Oklahoma City Indian Clinic, reported that it experienced a cyber-attack that compromised the protected health information (PHI) of 38,239 patients. The PHI involved included names, dates of birth, Social Security numbers, drivers’ license numbers, tribal identification numbers, health insurance information, medications prescribed, and other treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice. In response to the breach, the CE provided complimentary credit monitoring services and strengthened its technical safeguards to better protect its PHI. Staff were retrained on cybersecurity measures.