The San Francisco Municipal Transportation Agency’s board of directors is expected to approve a $2.5 million contract on Tuesday to a company that investigates workers compensation claims.

Workers comp claims at the SFMTA, which operates Muni, are numerous, with an average of 700 reports filed each year. About 25 percent of those claims merit extensive investigation, according to the agency.

To monitor any potentially dubious reports, the SFMTA outsources its claims investigations to an independent contractor. On Tuesday, the agency will vote on a five-year contract worth $2.5 million with Probe Information Services Inc., a firm that specializes in worker compensation claims.

wreisman@sfexaminer.com