Health Care Service Corporation Headquarters & Corporate Office

About Health Care Service Corporation

Health Care Service Corporation, commonly known as HCSC, is one of the largest customer-owned health insurers in the United States. The organization traces its roots to 1936, when it was incorporated to improve access to affordable health coverage through the Blue Cross and Blue Shield models. The Blue Cross plan for hospital care and the Blue Shield plan for physician services eventually merged in 1975 to form the modern Health Care Service Corporation structure.

Today, HCSC provides health-benefit solutions to individuals, families, employers, Medicare and Medicaid members, and other customers across the United States. Its principal Blue Cross and Blue Shield health plans operate in Illinois, Texas, Montana, New Mexico, and Oklahoma. HCSC has also expanded through subsidiaries and diversified healthcare businesses offering pharmacy solutions, dental and life insurance, self-funded employer services, health data technology, and related healthcare-management services.

HCSC operates as a Mutual Legal Reserve Company, meaning it is not a conventional publicly traded insurer with outside stockholders. As of 2026, the company serves approximately 27 million people, employs more than 34,000 people, and reported approximately $66.8 billion in 2025 revenue based on statutory filings. Maurice Smith serves as Chairman, President and Chief Executive Officer.

Health Care Service Corporation Headquarters & Corporate Office Address

Current Headquarters

Health Care Service Corporation
300 East Randolph Street
Chicago, IL 60601-5099
United States

HCSC’s current corporate, administrative, and mailing headquarters is 300 East Randolph Street in downtown Chicago. Current 2026 company and insurance-rating records identify the same address as both the domiciliary and administrative office of Health Care Service Corporation.

Corporate Office

Health Care Service Corporation
300 East Randolph Street
Chicago, IL 60601-5099

The Chicago office houses executive leadership, corporate administration, finance, legal, compliance, technology, insurance operations, communications, and other enterprise functions.

Mailing Address

HCSC uses the same primary address for general corporate correspondence

300 East Randolph Street
Chicago, IL 60601-5099

Certain member claims, appeals, grievances, payments, and plan-specific correspondence use different addresses. Members should follow the address printed on their insurance card, Explanation of Benefits, or plan documents.

Other Important Address

For HCSC civil-rights grievances

Office of Civil Rights Coordinator
300 E. Randolph St., 35th Floor
Chicago, IL 60601

This address is specifically published for discrimination and accessibility grievances rather than normal member claims or billing issues.

Quick Information

Corporate Phone Number

312-653-6000

This is HCSC’s verified main General Inquiries and Chicago headquarters number.

Customer Service Number

HCSC does not publish one universal member Customer Service number covering all Blue Cross Blue Shield plans and subsidiary businesses.

Members should normally call the number printed on their health-plan identification card. For general HCSC corporate routing:

312-653-6000

Corporate Office Address

300 East Randolph Street, Chicago, IL 60601-5099

Headquarters Address

300 East Randolph Street, Chicago, IL 60601-5099

Email

HCSC does not publish one universal unsecured member-service email.

Media: media@hcsc.net
Copyright: CopyrightInformation@hcsc.com
Civil Rights: civilrightscoordinator@bcbsil.com.

Industry

Health Insurance, Managed Care, Medicare, Medicaid, Employer Benefits, Pharmacy Solutions, Dental and Life Insurance, Healthcare Technology

Founded

1936

Health Care Service Corporation was incorporated in 1936 and began operations shortly thereafter.

Number of Employees

34,000+ employees

Current HCSC corporate materials report more than 34,000 employees.

Number of People Served

Approximately 27 million people

HCSC provides health-benefit solutions to approximately 27 million people across the United States.

Corporate Office Hours

HCSC does not prominently publish general public walk-in hours for its Chicago headquarters.Members should contact their specific health-plan Customer Service department before visiting any office.

Website

https://www.hcsc.com/

Investor Relations / Careers Page

HCSC is a mutual organization and does not maintain a conventional public-stock Investor Relations department.

Careers

https://careers.hcsc.com/

Health Care Service Corporation Products & Services

Blue Cross and Blue Shield Health Plans

HCSC operates Blue Cross and Blue Shield plans in Illinois, Texas, Montana, New Mexico, and Oklahoma. These plans provide individual, employer-sponsored, government-program, and other health-benefit products tailored to each state’s market and regulatory requirements.

Individual and Family Health Insurance

HCSC companies offer individual and family health plans for customers purchasing coverage outside an employer. Available products, provider networks, deductibles, premiums, and benefits vary by state and plan.

Employer Health Plans

HCSC serves businesses ranging from small employers to large national accounts. Services can include insured health plans, self-funded arrangements, provider-network access, claims administration, wellness programs, and healthcare-management tools.

Medicare Plans

HCSC provides Medicare-related coverage through eligible health-plan subsidiaries and affiliated businesses. Offerings can include Medicare Advantage, Medicare Supplement, and prescription-related solutions, depending on the state and product.

Medicaid Services

HCSC participates in Medicaid and other government-sponsored healthcare programs in eligible markets. These services are designed to coordinate benefits and access to care for qualifying members.

Self-Funded Employer Solutions

Through HCSC businesses such as Luminare Health, employers can access third-party administration and self-funded benefit services. These solutions help employers structure health benefits while managing claims, networks, administration, and member support.

Pharmacy Solutions

HCSC’s healthcare portfolio includes pharmacy-related benefits and services. These solutions are designed to manage prescription access, costs, medication programs, and other pharmacy-benefit needs.

Dental Insurance

HCSC subsidiaries and affiliates provide dental-benefit products for individuals, groups, and employers. Dental coverage can include preventive, basic, and major dental services according to the applicable plan.

Life Insurance

Life and ancillary insurance products are available through related HCSC businesses. These products can complement medical benefits and provide additional financial protection to employees and families.

Health Data and Technology Solutions

HCSC invests in digital healthcare and data technology designed to improve member experiences, identify health risks, coordinate care, and help employers or providers better understand healthcare utilization.

Provider Network Services

HCSC works with hospitals, physicians, clinics, and other healthcare professionals across its markets. Network-management teams negotiate arrangements, maintain provider relationships, and support member access to covered healthcare services.

Care Management

Care-management programs can support members with complex, chronic, or high-cost health conditions. Depending on the plan, members may receive guidance from nurses, care coordinators, behavioral-health professionals, pharmacists, and other healthcare teams.

Maternal and Infant Health Programs

HCSC has expanded programs aimed at improving maternal and infant health, including support designed to connect pregnant members with healthcare, education, and community resources. The company’s current initiatives also include mobile health programs and preventive services.

Mobile Health Programs

HCSC supports mobile-health initiatives that deliver preventive care and health services directly in communities. The company reported more than 141,000 immunizations and other preventive services through mobile-health programs during 2025.

Health Care Service Corporation Corporate Phone Numbers

Corporate Phone Number

312-653-6000

Corporate Headquarters Number

312-653-6000

Headquarters Number

312-653-6000

Corporate Office Number

312-653-6000

These are the verified HCSC general corporate-routing numbers for the Chicago office.

Customer Service Number

HCSC does not publish one universal member-service number.

Members should call the number shown on their insurance ID card for the fastest account-specific assistance.

Customer Support Number

General HCSC routing

312-653-6000

HCSC Illinois Office Number

800-654-7385

Montana Office Number

406-437-5000

New Mexico Office Number

800-835-8699

Texas Office Number

972-766-6900

Oklahoma Office Number

918-551-3500.

Toll-Free Number

No single toll-free number covers every HCSC member.Plan-specific toll-free support appears on member identification cards and plan materials.

Sales Number

HCSC does not publish one universal corporate sales number.Employer or insurance-sales inquiries should be directed through the applicable state Blue Cross Blue Shield plan.

Billing Number

No universal HCSC billing line exists because billing is administered by individual health plans and products.Members should use their plan’s Member Services number.

Regional Office Number

Verified market contacts include Illinois, Montana, New Mexico, Texas, and Oklahoma numbers listed above.

Branch Office Number

HCSC does not use conventional public retail branches. Health-plan offices and affiliated businesses maintain their own contacts.

International Number

HCSC does not publish one universal international Customer Service number.

Members traveling internationally should use the number or international-assistance instructions provided by their health plan.

Emergency / After-Hours Number

HCSC is a health insurer, not an emergency medical provider.For medical emergencies, call 911 or local emergency services.

Investor Relations Number

Not applicable in the conventional publicly traded company sense.HCSC is a mutual legal reserve company.

Media / Press Number

HCSC directs media inquiries to

media@hcsc.net

Journalists who need telephone routing can call

312-653-6000.

Human Resources Number

866-977-7378

Select Option 2 for Employment Verification.

Accessibility / Language Assistance

855-710-6984

HCSC publishes this number for reasonable modifications, communication aids, and language assistance.

Civil Rights Grievance Number

855-664-7270

TTY/TDD

855-661-6965.

How to Reach a Real Person at Health Care Service Corporation

For a health-plan claim, prior authorization, provider-network question, prescription issue, billing concern, coverage question, or appeal, the best route is not usually the HCSC headquarters number. Members should first call the Member Services number shown on the front or back of their insurance card because that number connects directly to the Blue Cross Blue Shield plan, subsidiary, or specialized benefit team administering the account.

If you do not know which HCSC entity manages the issue, call 312-653-6000 for general corporate routing. Before calling, have the member’s full name, member identification number, group number, date of service, provider name, claim number, and any previous case or reference numbers available. Avoid sending sensitive health or financial information through ordinary unsecured email unless the company specifically instructs you to do so.

For discrimination, disability-access, or language-assistance concerns, use the dedicated civil-rights channels rather than ordinary Member Services. HCSC provides 855-710-6984 for communication and language assistance and 855-664-7270 for civil-rights grievances.

How to File a Complaint Against Health Care Service Corporation

Complaints against HCSC can involve denied claims, coverage disputes, billing, prior authorizations, provider-network problems, Medicare or Medicaid services, prescription benefits, discrimination, privacy, or Customer Service. Before escalating, gather the insurance card, Explanation of Benefits, claim number, provider bills, denial letters, medical documentation where relevant, dates of calls, and previous case numbers.

Step 1: Contact Customer Service

Start with the Member Services telephone number printed on the insurance ID card. Explain the problem clearly and request that the representative document the complaint. Provide the claim, billing, or authorization details involved and ask what internal process applies. Record the representative’s name, date and time of the call, case number, and any promised follow-up so there is a documented history if the issue must be escalated.

Step 2: Contact the Relevant Department

If normal Customer Service cannot resolve the problem, contact the department responsible for the issue, such as Claims, Pharmacy Benefits, Prior Authorization, Provider Relations, Medicare, Medicaid, Appeals, or Billing. Specialized teams generally have greater access to the rules and documentation affecting a particular case. Provide copies of supporting information and clearly identify the specific decision or transaction being disputed.

Step 3: Request Supervisor or Management Review

Ask for a supervisor or escalation specialist if the first two levels do not resolve the complaint. Explain the prior contacts and provide the existing case numbers rather than restarting the complaint. Request a written explanation of the company’s position, including the relevant plan language, medical policy, contractual provision, or billing rule when applicable.

Step 4: Use the Company’s Written Complaint Channel

Use the formal grievance or appeals procedure described in the member’s plan documents or denial letter. Written complaints are particularly important for claim denials, medical-necessity disputes, coverage exclusions, and benefit appeals because filing deadlines may apply. Send the requested documentation using the address, secure portal, fax, or other channel specified by the member’s HCSC health plan and retain proof of submission.

Step 5: Contact Corporate Headquarters

For a serious unresolved corporate matter, correspondence can be sent to Health Care Service Corporation, 300 East Randolph Street, Chicago, IL 60601-5099. Include the member’s contact information, relevant HCSC plan, complaint reference numbers, dates, a concise chronology, and the resolution requested. Do not send original medical or financial documents. Corporate correspondence does not replace any formal appeal deadline stated in the health plan.

Step 6: Use the Specialized Complaint or Dispute Department

Civil-rights and accessibility grievances can be submitted to HCSC’s Office of Civil Rights Coordinator at 855-664-7270, TTY 855-661-6965, or civilrightscoordinator@bcbsil.com. Other specialized disputes should follow the applicable appeals, external-review, Medicare, Medicaid, pharmacy, or privacy process provided in the member’s documents.

Step 7: File With the Appropriate Regulator

Health-insurance regulation depends on the type of plan. Fully insured health-plan complaints can often be filed with the insurance department in the member’s state. Medicare issues may involve the Centers for Medicare & Medicaid Services, Medicaid complaints can involve the applicable state Medicaid agency, and civil-rights complaints may be filed with the U.S. Department of Health and Human Services Office for Civil Rights. HCSC specifically identifies HHS OCR as an external route for discrimination complaints.

Step 8: Use Consumer Protection or Financial Dispute Options

If the problem concerns premiums, unauthorized charges, misrepresentation, or another consumer transaction rather than a normal benefit determination, additional assistance may be available through the relevant state Attorney General, insurance consumer-assistance office, employer benefits administrator, or federal benefits agency. Employer-sponsored self-funded plans can be governed by different federal rules than fully insured policies, so the correct escalation route depends on the plan.

Step 9: Consider Formal Legal or Arbitration Procedures

If all internal appeals and regulatory options have been exhausted, review the health plan’s governing documents to determine whether additional external review, administrative hearing, arbitration, or litigation rights apply. Benefit disputes can have strict contractual or statutory deadlines, so customers considering formal legal action should preserve every Explanation of Benefits, denial, appeal decision, medical record, and correspondence and consider obtaining qualified legal advice before a deadline expires.