A Medicaid HMO created by the public Central Health hospital district lost $6.6 million in its first eight months, but officials say they still expect it to break even in its third year. Sendero Health Plans? average monthly membership as of November was 9,128 adults and children, fewer than its three better known competitors, according to documents filed with the Texas Health and Human Services Commission. But its membership is close to what the HMO?s creators predicted ? and so are the losses, Sendero President and CEO David Lamkin said. Those losses had been estimated to be $7.1 million, he said.