Missouri Medigap Anniversary Rule: Switch Without Underwriting

The rule creates an additional state guaranteed-issue opportunity for a person who already has Medicare Supplement coverage. It is tied to the annual anniversary of that policy—not the person’s birthday and not Medicare’s October 15–December 7 Annual Enrollment Period.

Missouri DCI describes the consumer application window as beginning 30 days before the annual policy anniversary and ending 30 days after it. The underlying Missouri regulation separately ties eligibility to termination of existing Medigap coverage within 30 days of the anniversary.

The protected change is generally from your current standardized plan to the same standardized plan with another insurer. Because standardized Medigap plan letters provide the same core medical benefits regardless of company, this can allow you to compare another carrier without giving up those standardized benefits.

If the same standardized plan is no longer available because of changes in Medigap plan designs, Missouri’s regulation provides specified guaranteed-issue alternatives. Which alternatives apply can depend on when the beneficiary first became eligible for Medicare, including the federal January 1, 2020 eligibility distinction affecting Plans C, F, D and G. A voluntary move to a different plan letter outside those protections may require medical underwriting.

• You currently have qualifying Medicare Supplement coverage.
• You know the policy’s annual anniversary date—not merely its rate-increase date.
• You apply within Missouri DCI’s stated window: 30 days before or 30 days after the policy anniversary.
• The protected replacement is generally the same standardized plan with another insurer, subject to the rule’s plan-availability provisions.
• The replacement issuer offers the applicable coverage and receives the required proof of your existing policy.
• The application, termination and replacement effective dates are coordinated to avoid a coverage gap.

1. Verify the anniversary date. Obtain it from the current policy or insurer.
2. Compare the same plan letter. Review premiums, rating method, discounts and carrier service.
3. Apply during the anniversary window. Missouri DCI currently describes the application period as the 30 days before or the 30 days after the policy anniversary.
4. Confirm the rule with the replacement carrier. Ask what proof it requires and how it will coordinate the replacement effective date.
5. Coordinate termination and start dates. Do not create a coverage gap or cancel the existing policy before the replacement transition is confirmed.
6. Keep written records. Save the application, policy anniversary proof, approval and effective-date confirmations.

The standardized medical benefits are the same for the same plan letter. The practical differences are generally price, pricing structure, discounts, administration, service and company experience.