Health Care Service Corporation (HCSC) is a large, customer-owned health insurance company headquartered in Chicago, Illinois. Founded in 1936, the full legal name of the private company is Health Care Service Corporation, a Mutual Legal Reserve Company. As one of the largest health insurers in the United States, HCSC employs more than 34,000 people and serves over 27 million members. The company's 2025 revenue was reported as $66.8 billion.
HCSC is an independent licensee of the Blue Cross and Blue Shield Association, operating plans in Illinois, Montana, New Mexico, Oklahoma, and Texas. The company's offerings include health coverage for employers, individuals, and families, as well as Medicare and Medicaid plans. Through various subsidiaries and affiliates, HCSC also provides related services and products, such as life, dental, and disability insurance, pharmacy solutions, and health technology services. In 2025, HCSC completed a major acquisition of Cigna's Medicare Advantage, Medicare Part D, and related businesses, expanding its national presence.
As a litigant in the provided case data, HCSC is shown as a plaintiff in its single tracked case and has not been a defendant. This posture as an operating company initiating litigation, rather than defending against patent assertions, is atypical for a large enterprise that might otherwise be a target for non-practicing entities (NPEs). The case was filed in the Delaware District Court, a common venue for corporate litigation but not one exclusively associated with high-volume patent assertion campaigns.
The company's sole tracked patent case is Health Care Service Corp v. OL Security LLC et al., filed in April 2026. Outside of patent litigation, HCSC has been involved in other legal matters, including class-action lawsuits related to a 2023 data breach and commercial disputes with other large corporations such as Walgreens.