The state and federal governments are prepared to take a lot of calls about the new Affordable Care Act, as millions of Americans need to sign up for an insurance policy to comply with the law. Many of them are going to have questions.

Here’s a list of key phone numbers and Web addresses:

Federal Health Insurance Marketplace

www.healthcare.gov

800-318-2596

Medicare (health insurance plans for those older than 65 and/or permanently disabled)

www.medicare.gov

800-633-4227

Medicaid (health insurance plans for low-income adults and children)

www.scdhhs.gov

888-549-0820

Tricare (health plans for military families and veterans)

www.tricare.mil

800-444-5445

S.C. Department of Insurance

www.doi.sc.gov

803-737-6160