Michigan Avenue Immediate Care

Michigan Avenue Immediate Care, also known as Michigan Ave Immediate Care, operates as an immediate care facility in Chicago, United States. The organisation provides walk‑in medical services for patients seeking urgent but non‑emergent care. As a healthcare provider, it handles protected health information, including personal identifiers, medical test results, and insurance data. Its headquarters are located in the United States, with the Chicago site serving the local community. The facility is identified by its aliases in public records and breach reports. No further details about its size, ownership, or parent‑company structure are disclosed in the available sources.

In December 2021, the facility experienced a security breach that exposed the protected health information of approximately 43,000 patients. The compromised data included Social Security numbers, proof of identification, laboratory analyses, COVID‑19 test results, and insurance details. Attackers exfiltrated over 580 gigabytes of information from systems such as the Yosi System, Docman, and Tempus. The intrusion was attributed to weak security controls, and the threat actors attempted ransom negotiations before resorting to selling the stolen data. Despite evidence provided by the attackers, the facility did not publicly acknowledge the incident or respond to inquiries. This event highlights the cybersecurity risks faced by healthcare organisations that manage sensitive patient information.