BreachCensus

Premera Blue Cross

United States of America

Premera Blue Cross is an organisation in Washington. It appears on the Washington State Attorney General breach-notification register with 5 confirmed incidents; the most recent notice was filed on July 10, 2023.

Data as of September 6, 2026.

Sources

Confirmed incident

US-WA — Ransomware Attack

Occurred
May 31, 2023
Disclosed
July 10, 2023

Timeline

  1. July 10, 2023
    Reported to regulator Regulator

    WA AG breach notification: 33,237 Washington residents affected

    source
What a Washington notice means

Required under RCW 19.255.010. Notice to the Attorney General is required when a breach affects more than 500 Washington residents.

Note: the count is Washington residents only, not a total.

Washington breach-notification register ↗

Confirmed incident

US-WA — Hacking/IT Incident

Occurred
January 28, 2023
Disclosed
March 5, 2023

Timeline

  1. March 5, 2023
    Reported to regulator Regulator

    WA AG breach notification: 36,211 Washington residents affected

    source
Confirmed incident

US-WA — Ransomware Attack

Occurred
April 27, 2022
Disclosed
July 18, 2022

Timeline

  1. July 18, 2022
    Reported to regulator Regulator

    WA AG breach notification: 1,303 Washington residents affected

    source
Confirmed incident

US-IA

Disclosed
August 11, 2020

Timeline

  1. August 11, 2020
    Reported to regulator Regulator

    IA AG breach notification: an unknown number of Iowa residents affected

    source
Confirmed incident

US-WI

Occurred
May 5, 2014
Disclosed
March 17, 2015

Timeline

  1. March 17, 2015
    Reported to regulator Regulator

    WI AG breach notification: an unknown number of Wisconsin residents affected

    source

Related

Disclosed around the same time