University Medical Center of Southern Nevada: 1,300,000 individuals, Aug 2021.

OCR classifies the incident as a hacking or IT incident, with the breached information held in a network server. Hacking/IT Incident is the type recorded on 31 of the 55 Nevada filings (56%) and on 76% of all filings submitted in 2021. Network Server is the most common location in the state, appearing on 55% of Nevada filings.

No business associate is recorded on the filing; 25% of Nevada filings do involve one. At 1,300,000 individuals the breach is 334 times the Nevada median filing of 3,898 and 325 times the national median of 4,000 across all 7,884 filings. It is one of 149 filings on the register of one million or more individuals.

As of 28 August 2026 the case is listed in the HHS OCR breach portal archive. OCR's closing summary of the case is reproduced in full below.

Nevada's breach notification statute (Nev. Rev. Stat. 603A.010 et seq.) requires notice to affected residents in the most expedient time possible and without unreasonable delay. Its attorney general threshold: no AG notification requirement. The HIPAA Breach Notification Rule ran alongside it: notice to affected individuals and to HHS without unreasonable delay and no later than 60 days after discovery, which is the clock that put this filing on the portal.

Multiplying 1,300,000 individuals by IBM's $160 customer-PII cost per record (Cost of a Data Breach 2025, the figure the site's calculator uses) gives a modelled $208M; the 2026 edition's $192 gives $250M. Both are modelled estimates with the method shown, not costs disclosed by University Medical Center of Southern Nevada. Because the filing is above the roughly 100,000-record range in which the per-record figure is reliable, the result is an upper bound, not an estimate: fixed costs are spread across far more records at this scale.