Breach filing
ArchivedDefense Health Agency (TriWest): 11,844 individuals, May 2026.
Defense Health Agency (TriWest) reported a breach of unsecured protected health information to the HHS Office for Civil Rights on 21 May 2026. The filing records the organisation as a health plan in Virginia and lists 11,844 individuals affected, which makes it the 51st largest of the 157 Virginia filings on the register and the 128th largest of the 441 filings submitted nationally in 2026. Among the 11 Virginia filings made in 2026 it ranks 4th.
Individuals affected
11,844
As reported to HHS
Modelled cost (IBM 2025)
$1.90M
Method shown, not disclosed
Rank in VA
51st
of 157 Virginia filings
Rank in 2026
128th
of 441 filings nationally
Section F.1 / The filing
As posted by HHS OCR
Every value below is the portal's own field for this filing, plus its rank within the register.
- Covered entity type
- Health Plan
- Individuals affected
- 11,844
- Breach submission date
- 21 May 2026
- Submission year
- 2026
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- Yes
- State
- Virginia (VA)
- Portal status
- listed in the HHS OCR breach portal archive
- Rank in Virginia by size
- 51st of 157
- Rank in 2026 nationally
- 128th of 441
- Virginia median filing
- 4,441 individuals
- Register id (derived)
- VA-20260521-defense-health-agency-triwest
Section F.2 / In context
Where this filing sits in Virginia and in 2026
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 99 of the 157 Virginia filings (63%) and on 86% of all filings submitted in 2026. Network Server is the most common location in the state, appearing on 53% of Virginia filings.
A business associate is recorded as present on the filing, as it is on 39% of Virginia filings. At 11,844 individuals the breach is 2.7 times the Virginia median filing of 4,441 and 3.0 times the national median of 4,000 across all 7,884 filings. It sits in the 10,000 to 99,999 band, which holds 1,938 filings.
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.
Virginia's breach notification statute (Va. Code 18.2-186.6) requires notice to affected residents without unreasonable delay. Its attorney general threshold: all breaches (concurrent with individual notice). 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 11,844 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 $1.90M; the 2026 edition's $192 gives $2.27M. Both are modelled estimates with the method shown, not costs disclosed by Defense Health Agency (TriWest). For scale, IBM's 2026 average cost of a healthcare breach is $6.64M, so this filing models at 0.3 times the sector average.
Section F.3 / OCR closing summary
The portal's archived description, in full
Written by the Office for Civil Rights when the case was closed and reproduced verbatim from the HHS export.
The covered entity (CE), Defense Health Agency, reported that several employees were the targets of an email phishing scheme that affected the protected health information (PHI) of approximately 11,844 individuals. The PHI involved names, addresses, dates of birth, other identifiers, claims information, diagnoses/conditions, and other treatment information. The CE notified HHS, the media, and the affected individuals. OCR provided technical assistance to the CE regarding the HIPAA Rules.
Section F.5 / Modelled cost
11,844 individuals through IBM's per-record figures
Modelled cost / method shown, not a disclosed cost
ModelledIBM 2025 customer PII, $160 per record
$1.90M
11,844 x $160
IBM 2026 customer PII, $192 per record
$2.27M
11,844 x $192
Method: individuals affected, as reported by Defense Health Agency (TriWest) to HHS, multiplied by IBM's customer-PII cost per record (Cost of a Data Breach 2025 Figure 6 and the 2026 edition). No cost has been disclosed by the entity for this filing; the figure is a planning estimate, not a fact about the breach. IBM's per-record figures come from mid-volume breaches and IBM cautions against applying them to breaches involving millions of records; the site's per-record page explains where the multiplication holds and where it breaks down.
Context: IBM's average cost of a healthcare breach is $6.64M in the 2026 report ($7.42M in 2025); the global average across all sectors was $4.44M in 2025.
Cost per record: method and limits / Healthcare breach cost, IBM 2026
Section F.6 / Notification clock
Virginia statute and the HIPAA rule
State notification statute
Virginia: Va. Code 18.2-186.6
- Notice to individuals
- Without unreasonable delay
- Attorney general threshold
- All breaches (concurrent with individual notice) (Concurrent with individual notification)
- Private right of action
- Limited: Individuals may recover direct economic damages (no non-economic damages)
- Penalty
- AG may impose civil penalties up to $150,000 per breach
The HIPAA Breach Notification Rule runs alongside the state statute: notice to affected individuals and to HHS without unreasonable delay and no later than 60 days after discovery.
Section F.7 / Peer filings
Virginia filings closest in size
Neighbours by size rank among Virginia filings in 2026, topped up from other years where 2026 has too few. Filings of 10,000 or more link to their own page.
| Covered entity | Type | Individuals | Submitted | Breach type | Location | BA |
|---|---|---|---|---|---|---|
| Defense Health Agency | Health Plan | 96,271 | 12 Mar 2026 | |||
| Avosina Healthcare SolutionsOpen | Business Associate | 44,425 | 10 Jan 2026 | |||
| Averhealth HoldingsOpen | Healthcare Provider | 9,909 | 2 Jul 2026 | |||
| Stafford Oral Surgery P.C. | Healthcare Provider | 7,019 | 15 May 2026 |
Index / Companion schedules
13 HHS breach register
→Hub: every filing, by state, year and entity.
04 Biggest breaches
→Mega-breaches with primary-source cost figures.
Industry / Healthcare
→IBM 2026: $6.64M average, 13 years at #1.
Regulation / HIPAA penalties
→OCR enforcement tiers and the 60-day rule.
11 50-state laws
→Deadline, AG threshold and penalties per state.
Cost / Per record
→Where the per-record model is reliable.
Provenance
Source: U.S. Department of Health and Human Services, Office for Civil Rights, Breach Portal (breaches affecting 500 or more individuals), retrieved 2026-08-28. Public domain. Individuals affected and dates as reported by the covered entity.
Portal: ocrportal.hhs.gov breach report. Statutory basis: HITECH Act section 13402(e)(4): the Secretary must post a list of breaches of unsecured protected health information affecting 500 or more individuals. Breaches affecting fewer than 500 individuals are reported to OCR annually and are not posted, so they are not on this register. Status wording follows the portal's two tabs ("Cases Currently Under Investigation" and "Archive") as of 28 August 2026; a filing moves to the archive when OCR closes the case. Modelled costs on this site are a method applied to the reported count, using IBM Cost of a Data Breach per-record figures, and are never a cost disclosed by the entity. This row: hhs-breach-archive__2026-08-28.csv, export row 23.
Corrections: if you represent a listed entity and the portal row has been amended, email [email protected] with the portal entry and we will re-pull the export.