---
title: "Ardent Health Services security incident"
description: "What the retained public evidence establishes about the Ardent Health Services incident, its attack path, impact, and response."
incident_type: "Cybersecurity incident"
status: "active"
last_modified: "2026-09-19"
canonical_url: "https://www.ally.security/incidents/ardent-health-services-security-incident-2023"
markdown_url: "https://www.ally.security/incidents/ardent-health-services-security-incident-2023.md"
stix_url: "https://www.ally.security/incidents/ardent-health-services-security-incident-2023/stix.json"
---

# Ardent Health Services security incident

Ransomware. ER patients diverted across multiple states.

Last modified Sep 19, 2026 · 1 source

## Summary

- **Environment:** Hospital system (30 hospitals)
- **Operational impact:** ER patients diverted across multiple states
- **Financial impact:** No financial figure is established by the reviewed source evidence

## What happened

In 2023, Ardent Health Services experienced an incident in its hospital system (30 hospitals) environment. The retained source describes the attack path as follows: Ransomware. [1](#source-1)

The documented consequence was: ER patients diverted across multiple states. [1](#source-1)

## Impact

- Documented impact: ER patients diverted across multiple states. [1](#source-1)
- No financial loss, ransom amount, recovery cost, or regulatory penalty is established by the reviewed source evidence.

## Threat Group & Attack Vector

The retained source describes the attack path as follows: Ransomware. The canonical record does not add intrusion steps beyond those supported by the source. [1](#source-1)

### Actors

- No threat actor group has been identified in the reviewed public evidence.

### TTPs

- [T1486 — Data Encrypted for Impact](https://attack.mitre.org/techniques/T1486/) — mapped from the cited behavior. [1](#source-1)

## Response

The reviewed source does not describe containment, notification, or restoration steps in enough detail to summarize them responsibly.

This account is bounded to [Ardent Health Services Reports Information Technology Security Incident](https://ardenthealth.com/our-stories/ardent-health-services-reports-information-technology-security-incident). Details absent from that evidence are left unresolved rather than inferred. [1](#source-1)

## Assets

[Download the case-scoped STIX 2.1 bundle](<https://www.ally.security/incidents/ardent-health-services-security-incident-2023/stix.json>)

## Sources

Primary source records used to research this incident.

<a id="source-1"></a>

### Ardent Health Services Reports Information Technology Security Incident

official · Ardent Health Services

<https://ardenthealth.com/our-stories/ardent-health-services-reports-information-technology-security-incident>

<details>
<summary>Evidence ledger</summary>

Review the supporting structured claims.

1. **Resulted In · 95% confidence · current**  
   Ardent Health Services security incident: Ransomware.
2. **Resulted In · 100% confidence · current**  
   Ardent Health Services security incident: The reviewed source documents the ardent health services security incident involving Ardent Health Services.
3. **Used Attack Technique · 90% confidence · current**  
   Ardent Health Services security incident: https://attack.mitre.org/techniques/T1486/
4. **Affected Organization · 100% confidence · current**  
   Ardent Health Services security incident: Ardent Health Services
5. **Resulted In · 84% confidence · current**  
   Ardent Health Services security incident: ER patients diverted across multiple states.

</details>