In December 2021, CMS renewed the contract for the NGS MAC for "Jurisdiction K," New York and New England. This MAC, which is related to Anthem, also has a midwestern MAC with MN, WI, IL aka J6.
On May 1, 2022, CMS renewed the contract for FCSO MAC for "Jurisdiction N," which is Florida and Puerto Rico. Like the Novitas MAC, FCSO MAC is related to Florida BCBS. In the last couple years, to my observation, Novitas MAC and FCSO MAC have had more policies in closer (or identical) alignment, which wasn't always the case.
See the MAC page at CMS here:
https://www.cms.gov/Medicare/Medicare-Contracting/Medicare-Administrative-Contractors/Whats-New-
