The top 25 Medicare Advantage insurers enrolled a combined 26.3 million lives, or 87.9% of the national market, as of the fourth quarter of 2022, according to AIS’s Directory of Health Plans. Among the large national insurers, only market leader UnitedHealthcare and Centene Corp. — which has rapidly expanded into MA following its 2020 acquisition of WellCare — each saw year-over-year enrollment growth of more than 10%. Centene expanded to 327 new counties for the 2022 plan year, compared to United’s 276. Cigna Corp., meanwhile, saw its MA enrollment decline by 5.8%, despite expanding to three new states for 2022. The company will bring its MA offerings to New York and Kentucky for the 2023 plan year. Among regional insurers, Guidewell Mutual Holding Corp., the parent company of Florida Blue, saw explosive growth of nearly 75% following its February acquisition of Triple-S Management Corp., one of the largest MA insurers in Puerto Rico. Highmark Health, SCAN Health Plan and Blue Cross and Blue Shield of Minnesota all saw enrollment gains of more than 20%. See the complete list in the table below.