CO| The Colorado Division of Insurance‘s Bulletin No. B-4.153 requests information from insurers that will implement Medicare Advantage Plan service area reductions (SARs) in Colorado for the 2026 calendar year, due to some insurers withdrawing plans from certain areas or counties. Affected insurers must submit, by November 25, 2025, details about the company, the specific Medicare Advantage Plans and plan numbers impacted, the counties affected, the number of impacted beneficiaries by plan and county, and a copy of the notice sent to affected members outlining alternative coverage options. The goal is to support the Colorado State Health Insurance Assistance Program (SHIP) in counseling Medicare beneficiaries about their choices; this bulletin provides guidance but does not create new legal obligations, and it will be repealed January 1, 2026.