Breach filing
ArchivedAHMC Healthcare Inc. and affiliated Hospitals: 729,000 individuals, Oct 2013.
AHMC Healthcare Inc. and affiliated Hospitals reported a breach of unsecured protected health information to the HHS Office for Civil Rights on 25 October 2013. The filing records the organisation as a healthcare provider in California and lists 729,000 individuals affected, which makes it the 18th largest of the 776 California filings on the register and the 2nd largest of the 277 filings submitted nationally in 2013. Among the 34 California filings made in 2013 it ranks 1st.
Individuals affected
729,000
As reported to HHS
Modelled cost (IBM 2025)
$117M
Upper bound, method shown
Rank in CA
18th
of 776 California filings
Rank in 2013
2nd
of 277 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
- Healthcare Provider
- Individuals affected
- 729,000
- Breach submission date
- 25 October 2013
- Submission year
- 2013
- Type of breach
- Theft
- Location of breached information
- Laptop
- Business associate present
- No
- State
- California (CA)
- Portal status
- listed in the HHS OCR breach portal archive
- Rank in California by size
- 18th of 776
- Rank in 2013 nationally
- 2nd of 277
- California median filing
- 3,553 individuals
- Register id (derived)
- CA-20131025-ahmc-healthcare-and-affiliated-hospitals
Section F.2 / In context
Where this filing sits in California and in 2013
OCR classifies the incident as theft, with the breached information held in a laptop. Theft is the type recorded on 172 of the 776 California filings (22%) and on 48% of all filings submitted in 2013. Laptop appears on 9% of California filings.
No business associate is recorded on the filing; 33% of California filings do involve one. At 729,000 individuals the breach is 205 times the California median filing of 3,553 and 182 times the national median of 4,000 across all 7,884 filings. It is one of 801 filings of 100,000 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.
California's breach notification statute (Cal. Civ. Code 1798.82) requires notice to affected residents within 30 calendar days of discovery (effective 1 January 2026, SB 446). Its attorney general threshold: more than 500 California residents. 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 729,000 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 $117M; the 2026 edition's $192 gives $140M. Both are modelled estimates with the method shown, not costs disclosed by AHMC Healthcare Inc. and affiliated Hospitals. 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.
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.
Two unencrypted laptop computers containing the protected health information (PHI) of 729,000 individuals were stolen from a secure office on October 23, 2013. The types of PHI involved in the breach included financial information, diagnoses, conditions, treatment information, and demographic information. The covered entity (CE), AHMC, provided breach notification to HHS, affected individuals, and the media. Following the breach, the CE implemented and maintained an encryption plan. It also developed policies and procedures regarding access to and receipt and removal of electronic PHI (ePHI). It also improved safeguards to reduce risks and vulnerabilities to ePHI. As a result of this investigation, OCR provided technical assistance to the CE regarding its obligations to implement and maintain policies and procedures that comply with the Privacy and Security Rules, conduct an accurate and thorough risk analysis, and implement a risk management plan. OCR also provided technical assistance regarding encryption.
Section F.5 / Modelled cost
729,000 individuals through IBM's per-record figures
Modelled cost / method shown, not a disclosed cost
Upper boundIBM 2025 customer PII, $160 per record
$117M
729,000 x $160
IBM 2026 customer PII, $192 per record
$140M
729,000 x $192
Method: individuals affected, as reported by AHMC Healthcare Inc. and affiliated Hospitals 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
California statute and the HIPAA rule
State notification statute
California: Cal. Civ. Code 1798.82
- Notice to individuals
- Within 30 calendar days of discovery (effective 1 January 2026, SB 446)
- Attorney general threshold
- More than 500 California residents (Within 15 calendar days after notifying affected consumers)
- Private right of action
- Yes: Under CCPA Civ. Code 1798.150 for breaches from failure to maintain reasonable security; $107-$799 per consumer per incident (CPI-adjusted from $100-$750, effective Jan 2025)
- Penalty
- CCPA civil penalties of $2,663 per violation, $7,988 per intentional violation (CPI-adjusted, effective Jan 2025); CCPA private right of action for security-failure breaches
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
California filings closest in size
Neighbours by size rank among California filings in 2013, topped up from other years where 2013 has too few. Filings of 10,000 or more link to their own page.
| Covered entity | Type | Individuals | Submitted | Breach type | Location | BA |
|---|---|---|---|---|---|---|
| Sutter Health | Healthcare Provider | 845,441 | 3 Nov 2023 | |||
| County of Los Angeles Departments of Health and Mental Health | Healthcare Provider | 749,017 | 16 Dec 2016 | |||
| Health Net Community Solutions | Health Plan | 688,603 | 25 Mar 2021 | |||
| Crescent Health Inc. - a Walgreens Company | Healthcare Provider | 109,000 | 22 Feb 2013 | |||
| L.A. Gay & Lesbian Center | Healthcare Provider | 59,000 | 10 Dec 2013 |
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 6328.
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.