Call any doctor's office or pharmacy and they'll ask for two numbers from your card. Here's what each one actually is — and why you should treat one of them like a password.
Updated June 12, 2026
Your Member ID identifies you to your insurance company. Every claim, every call, every prescription runs through it. It's unique to you (sometimes with a suffix like -01 or -02 for each family member on the plan).
The Group Number identifies the plan itself — usually your employer's contract with the insurer. Everyone at your company on the same plan shares it. It tells the insurer which set of benefits applies to you.
Medical identity theft is real. Someone with your Member ID can rack up claims in your name. Don't post photos of your card, don't email it to strangers, and shred old cards when new ones arrive.
No — and it shouldn't be. Insurers stopped using SSNs as member IDs years ago. If anyone asks for your SSN to verify insurance, ask why; your Member ID should be enough.
Family plans often give each person a suffix: -01 is usually the main subscriber, -02 their spouse, and so on. The pharmacy needs the full number including the suffix.
Not necessarily. Plans you buy yourself (instead of through an employer) sometimes don't use group numbers. If an office insists on one, tell them it's an individual plan.
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