All Medigap policies are standardized. This means, they offer the same basic benefits no matter where you live or which insurance company you buy the policy from.
Title: What's Medicare Supplement Insurance (Medigap)?
Article Snip: "...Medicare Supplement Insurance (Medigap) is extra insurance you can buy from a private health insurance company to help pay your share of out-of-pocket costs in Original Medicare. Generally, you must have Original Medicare – Part A (Hospital Insurance) and Part B (Medical Insurance) – to buy a Medigap policy. ... Get Medigap basics and Learn what Medigap covers, how it works, and general costs."
Reference: www.medicare.gov