Massachusetts General Hospital
36 disclosures across 3 jurisdictions · 2021-11-05 → 2026-08-10. Severity score: 40 across 23 incidents (max per incident: crit=4 high=3 med=2 low=1; per-filing sum: 54).
1825-day window · this entity as victim
apparent from filed dates · see trail
of 2 clock verdicts
max per incident · per-filing sum: 54
Sector context · Healthcare
- This entity:
- 50.0% on-time (n=2 clock verdicts)
- Sector cohort:
- 19.2% on-time (n=2,370 clock verdicts)
Cohort: 9,572 filings from 4,213 organisations carrying NAICS 62 on the filing itself, same 1825-day window; merged entities counted once. Both percentages count clock verdicts through the same registry — a filing with no evaluable clock is excluded from both rather than counted as on time.
Compliance timing by regulator
Notice timing computed from the dates recorded in each filing — an indicative estimate from an automated clock, not a legal determination. Click any chip for this entity's source filings.
- Massachusetts1 on-time · 1 review · 0 late · 14 informational · 16
us-nh — no notification-clock framework implemented for this jurisdiction
us-vt — clock not computable from the dates recorded in the filings
Discovery dates behind these clocks: 2 letter-grounded · 2 unattributed. Only a date the notification letter itself states is fully defensible; a date derived from another field makes the verdict indicative.
Regulators holding filings from this entity
Every regulator that has received a visible filing naming this entity, all time — filings first.
- Massachusetts State AG (126)
- New Hampshire State AG (6)
- HHS OCR (4)
- Vermont State AG (1)
Breach History (5-Year Lookback)
Historical incident recurrence, cumulative exposure, and per-jurisdiction compliance record
within lookback window
late notice filings
median days between incidents
Per-jurisdiction compliance record
| Jurisdiction | On-time | Late | Rate |
|---|---|---|---|
| us-ma | 1 | 1 | 50% |
Cumulative data type exposure
Disclosure timeline
Most-recent 100 filings. Click a row to open the disclosure detail.
| Filed | Source | Jurisdiction | Severity | Affected | Clocks missed |
|---|---|---|---|---|---|
| 2026-08-10 | state_ag | us-ma | Medium | 1state | MA AG >30d |
| 2026-03-02 | state_ag | us-ma | Medium | — | |
| 2025-12-18 | state_ag | us-ma | Low | 1state | |
| 2025-08-07 | state_ag | us-ma | Low | 1state | |
| 2025-08-07 | state_ag | us-ma | Medium | 1state | |
| 2025-02-28 | state_ag | us-ma | Medium | 1state | |
| 2025-02-28 | state_ag | us-ma | Low | 1state | |
| 2024-06-07 | state_ag | us-ma | Low | 1state | |
| 2024-05-31 | state_ag | us-ma | Medium | 1state | |
| 2024-05-31 | state_ag | us-ma | Low | 1state | |
| 2024-03-29 | state_ag | us-ma | Medium | 1state | |
| 2024-02-21 | state_ag | us-vt | Low | — | |
| 2023-12-15 | state_ag | us-ma | Medium | 1state | |
| 2023-12-08 | state_ag | us-nh | Low | 1state | |
| 2023-10-13 | state_ag | us-ma | Medium | 1state | |
| 2023-08-25 | state_ag | us-ma | Low | 2state | |
| 2023-08-18 | state_ag | us-ma | Medium | 12state | |
| 2023-07-17 | state_ag | us-ma | Medium | 1state | |
| 2023-05-12 | state_ag | us-ma | Medium | 1state | |
| 2023-04-17 | state_ag | us-nh | Medium | 1state | |
| 2023-03-31 | state_ag | us-ma | Low | 1state | |
| 2023-03-09 | state_ag | us-ma | Low | 1state | |
| 2023-03-09 | state_ag | us-ma | Low | 1state | |
| 2023-01-11 | state_ag | us-ma | Low | 1state | |
| 2022-12-15 | state_ag | us-ma | Low | 1state | |
| 2022-12-15 | state_ag | us-ma | Medium | 1state | |
| 2022-12-05 | state_ag | us-ma | Low | 1state | |
| 2022-10-19 | state_ag | us-ma | Medium | 1state | |
| 2022-08-15 | state_ag | us-ma | Low | 1state | |
| 2022-06-21 | state_ag | us-ma | Medium | 1state | |
| 2022-05-27 | state_ag | us-ma | Low | 1state | |
| 2022-05-06 | state_ag | us-ma | Medium | 1state | |
| 2022-03-23 | state_ag | us-ma | Medium | 1state | |
| 2021-12-29 | state_ag | us-ma | Medium | 1state | |
| 2021-12-17 | state_ag | us-ma | Low | 1state | |
| 2021-11-05 | state_ag | us-ma | Low | 2state |