A dermatologist in Smithtown has agreed to pay more than $300,000 to resolve civil litigation that alleged he submitted false claims to government healthcare programs, federal officials said.

Barry A. Solomon, head of Deremedx Dermatology, also known as Dermatique, was ordered to pay $302,227.11 under terms of the agreement, U.S. attorney for the Eastern District of New York Robert L. Capers said Wednesday in a statement.

As part of the agreement, authorities said, Solomon, 59, of Long Beach, also will enter into a so-called integrity agreement that will lead to “compliance oversight” for the next three years. The agreement was approved by U.S. District Court Judge Leonard D. Wexler, authorities said.

A federal investigation revealed that between sometime around June 2009 and through “at least 2014” Solomon “repeatedly billed” for services performed “as if he were supervising the procedures” — though he was not in the office and, at times, even was out of the country, authorities said.

He also billed for what authorities called “impossible days,” meaning for more hours than he could have possibly worked.

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In one case, authorities said, Solomon billed Medicare for more than 26 hours of work in one calendar day.

The investigation also revealed, Capers said, that Solomon “occasionally double-billed Medicare” for some examinations and medical procedures, all in violation of the law.

“Health care providers who engage in fraudulent billing practices, including billing for services and procedures they did not perform, jeopardize critical government healthcare programs,” Capers said in the statement. “The message today is clear — if you engage in such conduct you will be held to account.”