Herb Fritch has told his bosses at Cigna he will step down as president of the Medicare insurance specialist next month, 16 years after launching the business.

Fritch, who stayed on as president of Cigna-HealthSpring after the $3.8 billion sale of the local insurer in 2012, plans to leave Nov. 11 but will stay with Cigna in an advisory role until the end of next year. Fritch launched HealthSpring’s predecessor, NewQuest, in 2000. The company now insures more than two million Medicare customers.