Guides Insurance

Medicare Supplement Guide

13 min read Educational Guide Updated March 07, 2026
Guide note: Written by the FundJos Editorial Team and reviewed for calculator consistency on March 07, 2026. This guide is for general educational purposes only and is not legal, tax, insurance, investment, or financial advice.

Understanding Medigap

Original Medicare (Parts A & B) doesn't cover all costs. Medicare Supplement Insurance (Medigap) fills the gaps, covering copays, coinsurance, and deductibles. Sold by private insurers, these plans provide predictable out-of-pocket costs.

Plan Types Available

Plans A-N available in most states. Plan F: Most comprehensive (not available to new beneficiaries after 2020). Plan G: Best for new enrollees, covers everything except Part B deductible. Plan N: Lower premium, some copays, good value. Compare benefits carefully - same letter plans have identical benefits across insurers.

Cost Comparison Example

Plan G from Company A: $150/month premium, covers all deductibles/copays except Part B ($226). Plan G from Company B: $180/month premium, same coverage. Shop around - prices vary significantly for identical coverage. Average savings: $300-$600/year.

When to Enroll

Best time: Open Enrollment Period (6 months after turning 65 and enrolling in Part B). During this time: Guaranteed issue, No medical underwriting, No waiting periods. After OEP: May be denied or charged more based on health. Don't miss this window.

Key Takeaways

Compare plans during Open Enrollment. Prices vary by company for same coverage. Must have Medicare Part A and B. Medigap doesn't include Part D drug coverage. Buy from any company licensed in your state. Use our Medicare Supplement Calculator to estimate costs.