By Chelsey Dulaney 

Centene Corp. on Friday gave a stronger-than-expected outlook for next year, as the Medicaid-focused health insurer benefits from expansions into big states like Florida and Ohio and from surging membership rates.

Centene said it expects to post per-share earnings of $5.05 to $5.35, ahead of the $4.92 a share projected by analysts polled by Thomson Reuters.

Premium and service revenue is expected to grow 32% to a range of $20.3 billion to $20.8 billion. Analysts were looking for $19.98 billion.

The St. Louis company also backed its guidance for 2014, which it has raised several times this year after posting results that have topped Wall Street expectations.

Health-care companies have largely benefited from the new health-care law as newly insured patients seek treatment. HealthCare.gov's second enrollment effort runs through Feb. 15.

Like Centene, insurer Aetna Inc. raised its outlook several times this year. But that company issued a weaker-than-expected profit forecast for next year earlier this week.

Shares of Centene were inactive premarket and have climbed 68% this year.

Write to Chelsey Dulaney at Chelsey.Dulaney@wsj.com

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