The state approved $11.9 million in economic development tax credits Wednesday to 10 companies that promised to create new jobs and invest in local communities, including Athenahealth Inc. and Richline Group Inc., a subsidiary of billionaire Warren Buffett’s Berkshire Hathaway, Inc.

The Economic Assistance Coordinating Council approved $9.5 million, the largest award on Wednesday, to Athenahealth to help the company add 1,900 new jobs and expand their operations in Watertown. Athenahealth has promised to nearly triple its workforce over the next 10 years. The electronic medical records company already has 1,100 employees in Watertown.

The council also agreed to award Richline, a jewelry manufacturing company, $400,000 in tax credits to support its growth in Attleboro. Richline, which recently bought a plant in Attleboro, plans to invest $3.6 million in new manufacturing equipment and interior building improvements, along with adding 100 new jobs.

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