UnitedHealth Group Incorporated operates as a diversified health care company in the United States. The company operates through four segments: UnitedHealthcare, Optum Health, Optum Insight, and Optum Rx. The UnitedHealthcare segment offers consumer-oriented health benefit plans and services for national employers, public sector employers, mid-sized employers, small businesses, and individuals; health care coverage, and health and well-being services to individuals age 50 and older addressing their needs; Medicaid plans, children's health insurance and health care programs; and health and dental benefits, and hospital and clinical services, as well as health care benefits products and services to state programs caring for the economically disadvantaged, medically underserved, and those without the benefit of employer-funded health care coverage. The Optum Health segment provides care delivery, care management, wellness and consumer engagement, and health financial services patients, consumers, care delivery systems, providers, employers, payers, and public-sector entities. The Optum Insight segment offers software and information products, advisory consulting arrangements, and managed services outsourcing contracts to hospital systems, physicians, health plans, governments, life sciences companies, and other organizations. The Optum Rx segment provides pharmacy care services and programs, including retail network contracting, home delivery, specialty and community health pharmacy services, infusion, and purchasing and clinical capabilities, as well as develops programs in the areas of step therapy, formulary management, drug adherence, and disease/drug therapy management. UnitedHealth Group Incorporated was founded in 1974 and is based in Minnetonka, Minnesota.

HCA Healthcare, Inc., through its subsidiaries, owns and operates hospitals and related healthcare entities in the United States. It operates general and acute care hospitals that offers medical and surgical services, including inpatient care, intensive care, cardiac care, diagnostic, and emergency services; and outpatient services, such as outpatient surgery, laboratory, radiology, respiratory therapy, cardiology, and physical therapy. The company also operates outpatient health care facilities consisting of freestanding ambulatory surgery centers, freestanding emergency care facilities, urgent care facilities, walk-in clinics, diagnostic and imaging centers, rehabilitation and physical therapy centers, radiation and oncology therapy centers, physician practices, and various other facilities. In addition, it operates behavioral hospitals, which provide therapeutic programs comprising child, adolescent and adult psychiatric care, adolescent and adult alcohol, drug abuse treatment, and counseling services. The company was formerly known as HCA Holdings, Inc. HCA Healthcare, Inc. was founded in 1968 and is headquartered in Nashville, Tennessee.

Tenet Healthcare Corporation operates as a diversified healthcare services company in the United States. The company operates through two segments: Hospital Operations and Services, and Ambulatory Care. Its general hospitals offer acute care services, operating and recovery rooms, radiology and respiratory therapy services, clinical laboratories, and pharmacies. The company also provides intensive and critical care, and/or coronary care units; cardiovascular, digestive disease, neurosciences, musculoskeletal, and obstetrics services; outpatient services, including physical therapy; tertiary care services, such as cardiothoracic surgery, complex spinal surgery, neonatal intensive care, and neurosurgery services; quaternary care services in heart and kidney transplants; and limb salvaging vascular procedure, acute level 1 trauma, intravascular stroke care, minimally invasive cardiac valve replacement, imaging, surgical robotic, and telemedicine access services. In addition, it offers a range of procedures and services, such as orthopedics, total joint replacement, and spinal and other musculoskeletal procedures; gastroenterology; pain management; otolaryngology; ophthalmology; and urology. It operates hospitals, ambulatory surgery centers, imaging centers, surgical hospitals, off-campus emergency departments, and micro-hospitals. Tenet Healthcare Corporation was founded in 1967 and is headquartered in Dallas, Texas.

Surgery Partners, Inc., together with its subsidiaries, owns and operates a network of surgical facilities and ancillary services in the United States. The company provides ambulatory surgery centers and surgical hospitals that offer non-emergency surgical procedures in various specialties, including orthopedics and pain management, ophthalmology, gastroenterology, and general surgery. It offers diagnostic imaging, laboratory, obstetrics, oncology, pharmacy, physical therapy, and wound care; and ancillary services, including multi-specialty physician practices, urgent care facilities, and anesthesia services. In addition, it offers single- and multi-specialty facilities. Surgery Partners, Inc. was founded in 2004 and is headquartered in Brentwood, Tennessee.

Concentra Group Holdings Parent, Inc. provides occupational health services in the United States. The company offers occupational and consumer health services, including workers' compensation injury care, urgent care, clinical testing, preventative care, and employer services, as well as wellness programs through occupational health centers and onsite clinics. It also provides Concentra Telemed, a telemedicine solution for the treatment of work-related injuries and illnesses, and employer services; pharmacy solution under the Concentra Pharmacy name; and Concentra Medical Compliance Administration, a third-party administrator that helps to manage abuse testing programs for employers with regulated or non-regulated workforces. The company was founded in 1979 and is based in Mechanicsburg, Pennsylvania. Concentra Group Holdings Parent, Inc. is a subsidiary of Select Medical Corporation.

Select Medical Holdings Corporation, through its subsidiaries, operates critical illness recovery hospitals, rehabilitation hospitals, outpatient rehabilitation clinics, and occupational health centers in the United States. It operates in four segments: Critical Illness Recovery Hospital, Rehabilitation Hospital, Outpatient Rehabilitation, and Concentra. The Critical Illness Recovery Hospital segment consists of hospitals that provide services for heart failure, infectious disease, respiratory failure and pulmonary disease, surgery requiring prolonged recovery, renal disease, neurological events, and trauma. The Rehabilitation Hospital segment offers therapy and rehabilitation treatments, including rehabilitative services for brain and spinal cord injuries, strokes, amputations, neurological disorders, orthopedic conditions, pediatric congenital or acquired disabilities, and cancer. The Outpatient Rehabilitation segment operates rehabilitation clinics that provide physical, occupational, and speech rehabilitation programs and services; and specialized programs, such as functional programs for work related injuries, hand therapy, post-concussion rehabilitation, pediatric and cancer rehabilitation, and athletic training services. The Concentra segment operates and provides occupational health centers, telemedicine platforms, onsite clinics, and contract services at employer worksites that deliver occupational health services, consumer health, physical therapy, and preventive care. Select Medical Holdings Corporation was founded in 1996 and is headquartered in Mechanicsburg, Pennsylvania.

Healthcare Services Group, Inc. provides management, administrative, and operating services to the housekeeping, laundry, linen, facility maintenance, and dietary service departments of nursing homes, retirement complexes, rehabilitation centers, and hospitals in the United States. It operates through two segments, Housekeeping and Dietary. The Housekeeping segment engages in the cleaning, disinfecting, and sanitizing of resident rooms and common areas of the customers' facilities, as well as laundering and processing of the bed linens, uniforms, resident personal clothing, and other assorted linen items utilized at the customers' facilities. The Dietary segment provides food purchasing, meal preparation, and professional dietitian services, which include the development of menus that meet the dietary needs of residents; and on-site management and clinical consulting services to facilities. It serves long-term and post-acute care facilities, hospitals, and the healthcare industry through referrals and solicitation of target facilities. The company was incorporated in 1976 and is based in Bensalem, Pennsylvania.

Community Health Systems, Inc. owns, leases, and operates general acute care hospitals in the United States. It offers general acute care, emergency room, general and specialty surgery, critical care, internal medicine, obstetrics, diagnostic, psychiatric, and rehabilitation services, as well as skilled nursing and home care services. The company also provides outpatient services at primary care practices, urgent care centers, free-standing emergency departments, ambulatory surgery centers, imaging and diagnostic centers, and direct-to-consumer virtual health visits. The company was incorporated in 1996 and is headquartered in Franklin, Tennessee.