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System Update Error at AOK Bayern Temporarily Locks 6,400 Electronic Patient Records

The insurer says data remained encrypted in backups throughout the incident.

Overview

  • AOK Bayern confirmed a technical processing error during a planned software update by IT providers that set thousands of ePA files to “closed,” not a cyberattack.
  • New electronic patient record accounts have been created for the roughly 6,400 affected insured persons, with previous documents being restored into them.
  • The health insurer says no unauthorized access occurred and the medical data were not deleted but were temporarily unavailable.
  • Some customers received automated messages that looked like opt-out confirmations, which triggered the closures despite no such requests.
  • Recovery work with IT vendors and Gematik is ongoing without a firm completion date, and patients needing urgent documents are advised to obtain them directly from care providers as the low-usage ePA rollout faces renewed scrutiny.