I didn’t get my Medicare card in the mail. View the Medicare card if you get benefits from the Railroad Retirement Board. Protect your Medicare Number like a credit card Only give personal information, like your Medicare Number, to health care providers, your insurance companies or health plans (and their licensed agents or brokers), or people you trust that work with Medicare, like your Contact Medicare.gov if you need help with: Your Medicare coverage Your Medicare account Contact Medicare.gov at 800-633-4227 for assistance, or start a live chat. You can talk or live chat with a real person, 24 hours a day, 7 days a week (except some federal holidays.) Related articles Help with agencies? What Is an MBI? Your Medicare Beneficiary Identifier (MBI) is the number printed on your red, white, and blue Medicare card. Doctors, hospitals, pharmacies, and insurance companies use this number to process your claims. In 2026, some beneficiaries will receive a new card with a different MBI. MBIs are numbers and upper-case letters. We use numbers 1-9 and all letters from A to Z, except for S, L, O, I, B, and Z. If you use lowercase letters, our system will convert them to uppercase letters. Organization type 1-800-MEDICARE Organization description General Medicare information, ordering Medicare booklets, and information about health plans. Covered states. A Medicare number allows a person to enroll in a Medicare plan or purchase a Medigap policy. Learn about finding the Medicare number here. Medicare is replacing ID numbers for 1.3 million enrollees. This is why it’s happening, what it means, and how to avoid delays or scams. Phone 1-800-MEDICARE (1-800-633-4227) For specific billing questions and questions about your claims, medical records, or expenses, log into your secure Medicare account, or call us at 1-800-MEDICARE. If you want Medicare to be able to give your personal information to someone other than you, you need to fill out an Authorization to Disclose Personal Health Information. Get this form in. The Medicare phone number is a crucial tool for beneficiaries seeking information about their coverage and claims. With updates set to enhance consumer protections and lower prescription drug costs in 2026, understanding how to effectively utilize this resource will empower seniors to make informed decisions about their healthcare. Make changes to your personal information Medicare uses the name, address, phone number, and date of birth on your Social Security record. Update your personal record if you have any changes to report.