Geography
Missouri: 164 healthcare breach filings.
Missouri entities have reported 164 breaches of 500 or more individuals to HHS since 2009, the 19th most of the 52 states and territories on the register, covering 17,507,373 individuals (18th by people affected). 17 are still under investigation. Hacking/IT Incident is the breach type on 61% of them, and network server the most common location (38%).
Filings
164
19th of 52 states and territories
Individuals affected
17,507,373
Median filing 4,800
Largest filing
5,466,931
Ascension Health, 2024
Hacking / IT share
61%
38 filings involve a business associate
Direct answer / Missouri on the HHS portal
The largest Missouri filing is Ascension Health (5,466,931 individuals, submitted 3 July 2024). The busiest year was 2025 with 21 filings. Healthcare Providers account for 75% of the state's filings. 63 filings of 10,000 or more individuals have their own page; the remaining 101 are listed in the table at the foot of this page.
Section MO.1 / Largest filings
Ten largest Missouri breaches
| # | Covered entity | Type | Individuals | Submitted | Breach type | Location | BA |
|---|---|---|---|---|---|---|---|
| 1 | Ascension Health | Healthcare Provider | 5,466,931 | 3 Jul 2024 | |||
| 2 | TriZetto Provider SolutionsOpen | Business Associate | 3,433,965 | 6 Feb 2026 | |||
| 3 | Navvis & Company, LLC | Business Associate | 2,824,726 | 22 Sep 2023 | |||
| 4 | Missouri Department of Social Services | Health Plan | 739,884 | 7 Aug 2023 | |||
| 5 | North Kansas City Hospital | Healthcare Provider | 502,438 | 3 Jan 2024 | |||
| 6 | Ascension HealthOpen | Healthcare Provider | 437,329 | 28 Apr 2025 | |||
| 7 | Saint Luke's Foundation | Healthcare Provider | 360,212 | 20 Aug 2020 | |||
| 8 | Thompson Coburn LLP | Business Associate | 305,088 | 4 Nov 2024 | |||
| 9 | SSM Health St. Mary's Hospital - Jefferson City | Healthcare Provider | 301,000 | 30 Jul 2018 | |||
| 10 | BJC Health System | Business Associate | 287,876 | 5 May 2020 |
Section MO.2 / By year
Missouri filings by submission year
Each year links to the national year page.
| Year | Filings | Individuals affected | Hacking / IT share | Filings with a page |
|---|---|---|---|---|
| 2009 | 1 | 1,000 | 0% | 0 |
| 2010 | 3 | 12,616 | 0% | 0 |
| 2011 | 6 | 15,732 | 17% | 0 |
| 2012 | 2 | 3,569 | 0% | 0 |
| 2013 | 11 | 55,283 | 9% | 2 |
| 2014 | 3 | 7,989 | 33% | 0 |
| 2015 | 5 | 25,854 | 20% | 1 |
| 2016 | 7 | 99,673 | 71% | 3 |
| 2017 | 12 | 140,389 | 33% | 3 |
| 2018 | 15 | 496,695 | 47% | 6 |
| 2019 | 12 | 602,907 | 67% | 6 |
| 2020 | 14 | 903,767 | 71% | 6 |
| 2021 | 8 | 73,007 | 75% | 1 |
| 2022 | 13 | 381,062 | 92% | 9 |
| 2023 | 11 | 3,745,209 | 73% | 4 |
| 2024 | 13 | 6,685,964 | 77% | 9 |
| 2025 | 21 | 787,914 | 90% | 10 |
| 2026 | 7 | 3,468,743 | 100% | 3 |
Section MO.3 / Composition
Breach type, location and who filed
Multi-valued fields count once per value.
Type of breach
Location of breached information
Covered entity type
Section MO.4 / Notification law
What Missouri law required alongside HIPAA
State notification statute
Missouri: Mo. Rev. Stat. 407.1500
- Notice to individuals
- Without unreasonable delay
- Attorney general threshold
- More than 1,000 Missouri consumers (Without unreasonable delay)
- Private right of action
- No: AG has exclusive enforcement authority
- Penalty
- Up to $150,000 per breach (or series) for willful and knowing violations
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 MO.5 / Filing pages
63 filings of 10,000 or more individuals
Each links to a page with the full filing, its rank in the state and year, OCR's closing summary where the case is archived, peers, and the modelled cost.
Section MO.6 / All other filings
101 filings below 10,000 individuals
Listed in full from the HHS export, largest first. These filings do not have their own page.
| Covered entity | Type | Individuals | Submitted | Breach type | Location | BA |
|---|---|---|---|---|---|---|
| Belden Inc. | Health Plan | 9,840 | 2 Apr 2021 | |||
| Ashley and Gray DDS | Healthcare Provider | 9,309 | 19 Jan 2010 | |||
| Missouri Department of Mental Health | Healthcare Provider | 9,000 | 24 Oct 2018 | |||
| Advocates for a Healthy Community dba Jordan Valley Community Health Center | Healthcare Provider | 8,842 | 22 Dec 2025 | |||
| Centene Management Corporation | Health Plan | 8,208 | 15 Oct 2015 | |||
| Burrell Behavioral Health | Healthcare Provider | 7,748 | 2 Sep 2016 | |||
| HITS Scanning Solutions, Inc. | Business Associate | 7,059 | 22 Oct 2011 | |||
| Carroll County Memorial Hospital | Healthcare Provider | 7,021 | 18 Jun 2024 | |||
| Putnam County Memorial Hospital | Healthcare Provider | 6,916 | 3 Nov 2021 | |||
| James R. Etzkorn, MD | Healthcare Provider | 6,845 | 19 Nov 2018 | |||
| James R. Etzkorn, MD | Healthcare Provider | 6,845 | 9 Nov 2018 | |||
| Southeast Health Center of Ripley County | Healthcare Provider | 5,944 | 11 Dec 2020 | |||
| Barnes-Jewish Hospital | Healthcare Provider | 5,850 | 18 Dec 2018 | |||
| Mo. Dept. of Mental Health | Healthcare Provider | 5,685 | 7 Feb 2017 | |||
| Children's Mercy Hospital | Healthcare Provider | 5,511 | 19 May 2017 | |||
| Pershing Health System | Healthcare Provider | 5,368 | 5 Jan 2023 | |||
| University of Missouri Health Care | Healthcare Provider | 5,074 | 11 Jun 2020 | |||
| Midwest Geriatric Management, LLC | Healthcare Provider | 4,814 | 14 Dec 2020 | |||
| J. A. Still Corporation | Business Associate | 4,800 | 18 Jan 2011 | |||
| Plumbers Local 8 Health & Welfare Fund | Health Plan | 4,790 | 2 Aug 2023 | |||
| Sheet Metal Local 36 Welfare Fund | Business Associate | 4,560 | 15 Jul 2013 | |||
| Perry County Memorial Hospital | Healthcare Provider | 4,538 | 22 Oct 2020 | |||
| St. Andrew's Resources for Seniors System | Healthcare Provider | 4,434 | 7 Feb 2025 | |||
| Choice Rehabilitation | Business Associate | 4,309 | 29 Dec 2018 | |||
| Children's Mercy Hospital | Business Associate | 4,067 | 15 Aug 2014 | |||
| HomeCare of Mid-Missouri, Inc. | Healthcare Provider | 4,027 | 14 Feb 2013 | |||
| Saint Louis County Department of Health | Healthcare Provider | 4,000 | 7 Jan 2015 | |||
| Kansas City Hospice, Inc | Healthcare Provider | 3,621 | 20 Dec 2024 | |||
| Dr. Dennis T. Myers, D.D.S., P.A. | Healthcare Provider | 3,364 | 24 Oct 2016 | |||
| Washington University School of Medicine | Healthcare Provider | 3,237 | 1 Nov 2019 | |||
| St. Louis University | Health Plan | 3,100 | 7 Oct 2013 | |||
| The Vein Doctor | Healthcare Provider | 3,000 | 3 Jun 2016 | |||
| Cornerstones of CareOpen | Healthcare Provider | 2,771 | 14 Feb 2025 | |||
| Pharma Medica Research Inc. | Healthcare Provider | 2,718 | 23 Jun 2017 | |||
| St. Anthony's Physician Organization | Healthcare Provider | 2,600 | 30 Aug 2013 | |||
| BLUE CROSS AND BLUE SHIELD OF KANSAS CITY | Health Plan | 2,546 | 11 Apr 2014 | |||
| Advocates for a Healthy Community Inc dba Jordan Valley Community Health Center | Healthcare Provider | 2,502 | 15 Sep 2023 | |||
| City of Joplin | Health Plan | 2,494 | 8 Sep 2021 | |||
| Cox Health | Healthcare Provider | 2,435 | 17 Sep 2012 | |||
| BJC HealthCare ACO, LLC | Healthcare Provider | 2,393 | 26 Feb 2016 | |||
| Lutheran Home for the AgedOpen | Healthcare Provider | 2,311 | 8 Jun 2026 | |||
| C2N Diagnostics, LLCOpen | Healthcare Provider | 2,027 | 27 Apr 2026 | |||
| St. John's Mercy Medical Group | Healthcare Provider | 1,907 | 9 Aug 2010 | |||
| John J. Pershing VA Medical Center | Healthcare Provider | 1,843 | 7 Mar 2018 | |||
| Fidelis Care New York | Health Plan | 1,680 | 31 Oct 2025 | |||
| Poplar Bluff Regional Medical Center | Healthcare Provider | 1,619 | 27 Apr 2020 | |||
| Bridget P Early MD LLC d/b/a Namaste Health Care | Healthcare Provider | 1,617 | 12 Oct 2017 | |||
| Children's Mercy Hospital | Healthcare Provider | 1,463 | 27 Jun 2018 | |||
| HealthRev Partners, LLC | Business Associate | 1,446 | 20 Feb 2025 | |||
| Robert Wheatley, DDS, PC | Healthcare Provider | 1,400 | 15 Nov 2010 | |||
| Midwest Womens Healthcare Specialist | Healthcare Provider | 1,376 | 26 Aug 2014 | |||
| InfoCrossing, Inc. | Business Associate | 1,357 | 13 Aug 2013 | |||
| Missouri Department of Social Services | Business Associate | 1,357 | 2 Aug 2013 | |||
| Maritz Holdings Inc. | Health Plan | 1,298 | 6 Apr 2021 | |||
| University of Missouri Health Care | Healthcare Provider | 1,288 | 23 Jun 2011 | |||
| St. Charles County Ambulance District | Healthcare Provider | 1,265 | 7 Mar 2025 | |||
| Polsinelli PC | Business Associate | 1,220 | 2 Dec 2022 | |||
| Leggett & Platt Incorporated Employee Benefit Fund | Health Plan | 1,200 | 4 Dec 2023 | |||
| Hogan Services Inc. Health Care Premium Plan | Health Plan | 1,134 | 11 May 2012 | |||
| Union Security Insurance Company | Health Plan | 1,127 | 17 Jun 2013 | |||
| Washington University School of Medicine | Healthcare Provider | 1,105 | 11 Jan 2013 | |||
| Embody Performance & Recovery | Healthcare Provider | 1,100 | 4 Nov 2024 | |||
| The MS Center of Saint Louis and Mercy Clinic Neurology - Town and Country | Healthcare Provider | 1,081 | 16 Sep 2017 | |||
| Washington University School of Medicine | Healthcare Provider | 1,056 | 14 Jul 2022 | |||
| Home State Health Plan, Inc. | Health Plan | 1,020 | 30 Dec 2020 | |||
| Missouri Dept. of Mental Health | Healthcare Provider | 1,000 | 21 Feb 2018 | |||
| Mid America Kidney Stone Association, LLC | Healthcare Provider | 1,000 | 28 Oct 2009 | |||
| Building Service Employees Insurance Health and Welfare Plan | Health Plan | 980 | 9 Jan 2025 | |||
| Union Security Insurance Company | Health Plan | 935 | 8 Apr 2011 | |||
| Fordland Clinic Inc. | Healthcare Provider | 881 | 26 Jul 2019 | |||
| ReDiscover Mental Health | Healthcare Provider | 877 | 1 May 2023 | |||
| Union Security Insurance Company | Health Plan | 850 | 9 May 2011 | |||
| SSM Health (Dr. Syed Khader) | Healthcare Provider | 836 | 9 Jun 2017 | |||
| Saint Louis University | Healthcare Provider | 800 | 10 Feb 2011 | |||
| Cedar Oaks Surgery Center | Healthcare Provider | 794 | 27 Jan 2023 | |||
| Woods Super Markets, Inc. | Healthcare Provider | 785 | 30 Jul 2021 | |||
| University of Missouri Health Care | Healthcare Provider | 736 | 17 May 2023 | |||
| Blue Cross and Blue Shield of Kansas City | Health Plan | 725 | 5 May 2017 | |||
| VA St. Louis Health Care System | Healthcare Provider | 724 | 1 Mar 2017 | |||
| University Of Missouri Health | Healthcare Provider | 706 | 5 Oct 2018 | |||
| Government Employees Health Association, Inc. | Health Plan | 696 | 22 Feb 2020 | |||
| Paraquad, Inc. | Healthcare Provider | 648 | 21 Jan 2021 | |||
| St. Louis Children's Hospital | Healthcare Provider | 643 | 9 Mar 2017 | |||
| SSM Health Cancer Care | Healthcare Provider | 643 | 9 Oct 2015 | |||
| Scharnhorst Ast Kennard Griffin PC | Business Associate | 639 | 14 Apr 2025 | |||
| VA St. Louis Health Care System | Healthcare Provider | 595 | 21 Nov 2019 | |||
| John J. Pershing VA Medical Center | Healthcare Provider | 589 | 11 Apr 2013 | |||
| United Cerebral Palsy Heartland | Healthcare Provider | 576 | 24 Apr 2020 | |||
| Employers and Laborers Locals 100 and 397 Health & Welfare Fund | Health Plan | 560 | 26 Aug 2019 | |||
| Missouri Department of Mental Health | Healthcare Provider | 537 | 8 Nov 2024 | |||
| Kansas City VAMC | Healthcare Provider | 534 | 11 Jun 2019 | |||
| Maranatha Village Inc. | Healthcare Provider | 520 | 24 May 2019 | |||
| VNA Home Health and Hospice | Healthcare Provider | 517 | 17 Mar 2021 | |||
| Truman Medical Center, Incorporated | Healthcare Provider | 503 | 9 Jun 2015 | |||
| Greater St. Louis Oral & Maxillofacial Surgery PCOpen | Healthcare Provider | 501 | 4 Dec 2025 | |||
| CareSTL Health, Inc. | Healthcare Provider | 501 | 3 Oct 2025 | |||
| Cerner Corporation | Business Associate | 501 | 17 Jun 2025 | |||
| Columbia Orthopaedic GroupOpen | Healthcare Provider | 500 | 18 Jun 2026 | |||
| MVP VIP Holdco dba Heart of America Eye CareOpen | Healthcare Provider | 500 | 5 Jun 2026 | |||
| BJC Health System | Business Associate | 500 | 27 May 2022 | |||
| Washington University School of Medicine | Health Plan | 500 | 23 May 2022 |
Index / Other states
Every state on the register
98
32
164
92
776
139
144
31
33
463
226
22
29
358
200
98
80
124
66
37
170
241
238
189
55
36
60
55
38
174
57
511
207
19
276
80
120
339
32
41
86
15
196
633
68
15
157
185
47
126
19
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.
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.