HackingHealthcareHealthcareStolen CredentialsSupply Chain (3P Vendor)Customer Data InvolvedData ExfiltratedIdentity (basic)Financial accountHealth (basic)PHILowContained

The Mount Sinai Medical Center, Inc.

bd_ac6fd1edeb1ee9ff · schema v1 · pii pii-v1

Severity

Low

Discovered

Jun 3, 2019

Filed

Aug 2, 2019

To disclose

9 weeks

Affected

2state residents only

Confidence

66%

Full breach record for The Mount Sinai Medical Center, Inc. →7 incidents on file

Mount Sinai Medical Center notified patients that its billing vendor, American Medical Collection Agency (AMCA), experienced unauthorized access to systems containing patient PHI, names, and financial info between Aug 2018 and Mar 2019. Mount Sinai's systems were not directly affected. Mount Sinai terminated the relationship with AMCA.

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Incident timeline

undetected · 306 days

discovery → filing · 9 weeks / 60 days

Aug 1, 2018

Begins

Jun 3, 2019

Discovered

Aug 2, 2019

Filed

vs. sector median

on median

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed2 affectedView incident

Name: The Mount Sinai Medical Center, Inc.
norm: the mount sinai medical center
Domain: mountsinai.org

Name: The Mount Sinai Medical Center, Inc.
norm: the mount sinai medical center
Domain: mountsinai.org
Industry: Healthcarellm

Discovered: Jun 3, 2019
Breach occurred: Aug 1, 2018 – Mar 30, 2019
Undetected for: 306 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: 2state-resident count only
Data types: Identity (basic)Financial accountHealth (basic)PHI
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1078 Valid AccountsT1119 Automated Collection
Threat actor: External
Third party: via American Medical Collection Agencyvendor
Initial access: trusted_relationship

During the incident: Ceased doing business with AMCA
Working to retrieve and secure all Mount Sinai data in AMCA’s database
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://dojmt.gov/wp-content/uploads/OCP/Data-Breach-NotificationDetails8.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 2, 2019
Raw hash: d0e5dd119dc78a4475b5a9ff8a770af2843b95d6ab475d81ba3734f7bc6fa9d9

Reporting entityThe Mount Sinai Medical Center, Inc.

Victim entityThe Mount Sinai Medical Center, Inc.

Incidentdiscovered Jun 3, 2019

Stated responseCeased doing business with AMCA

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov