Humana said that Bruce Broussard, a former McKesson Corp. executive who was named president of the Louisville, Ky.-based insurer last year, will take over as CEO in January.

Broussard, 50, who will retain his role as president, will succeed Humana CEO Michael McCallister, according to a news release. McCallister, 60, will remain chairman of the board.

Humana announced the executive transition as part of its third-quarter financial results.

It also announced three transactions, including an $850 million deal to acquire Metropolitan Health Networks, a medical services organization; a non-controlling equity interest in MCCI Holdings, a Miami-based medical services organization; and an acquisition of Certify Data Systems, a provider of health information exchange technology.

"Taken together, the three transactions we announced today unite key components of our integrated model, simplifying and enhancing our members' healthcare experience,” Broussard said in Humana's third-quarter results news release.

The Metropolitan Health Networks deal is expected to close in the first quarter of next year.

Both Metropolitan Health Networks, which paid about $416 million in cash and stock to acquire healthcare provider Continucare in 2011, and MCCI Group coordinate care for Medicare Advantage and Medicaid beneficiaries in the Florida market.

The Federal Trade Commission granted the MCCI deal early termination approval last week.

Financial terms of the MCCI Group and Certify Data Systems transactions were not disclosed. Certify Data Systems is based in San Jose, Calif.