Understand Your Medicare Supplement Options

Helping Californians Fill the Gaps in Original Medicare


At  Gaddis and Mast Insurance Services, we offer clear, personalized support for those looking to enroll in Medicare Supplement Insurance — also known as Medigap. These plans are designed to help cover out-of-pocket costs not paid by Original Medicare, such as deductibles, copayments, and coinsurance.


We’re here to help you review your options, compare plans, and choose coverage that fits both your health care needs and your budget.


We serve individuals across California, including Santa Rosa and throughout Nevada.

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  • An elderly couple is sitting at a table talking to a doctor.

  • A medical bill with a stethoscope and pills on it.

What Is Medicare Supplement Insurance? 


Medicare Supplement (Medigap) plans are offered by private insurance companies and work alongside your Original Medicare (Part A and Part B). These plans:


  • Help reduce out-of-pocket expenses
  • Allow you to see any doctor who accepts Medicare — with no referral needed
  • Provide nationwide coverage for peace of mind while traveling or relocating


Plans are standardized by letter (A, G, F etc). Benefits are the same. The difference is in the premium each company charges you. It is important to compare.


We’ll help you compare what’s available in your area.

How We Help

When you work with our team, you’ll get:

  • Free, unbiased guidance from licensed agents
  • Side-by-side comparisons of plan benefits
  • Clear explanations of coverage options and enrollment timelines
  • Ongoing support, including annual reviews of your coverage


Choosing a Medigap plan doesn’t have to be complicated. We’ll walk you through it step by

step, ensuring you understand your choices and feel confident in your decision.