The Seafarer Act Article 8

A seafarer can serve aboard a ship only when he qualified through a medical fitness examination and possesses a seafarer service book in accordance with relevant regulations.A seafarer who is working on a ship shall undergo periodic health examinations. The seafarer, who is unqualified by or refused to undergo such examination, shall not be permitted to work on board.Expenses for the medical health examinations for seafarers as provided by the preceding paragraph shall be on the employer’s account, affiliated to the Commission.Seafarers’ physical examination and health examinations shall be performed by the medical institutions which meet the prescribed conditions, or the medical institutions affiliated to the department of the organization where the seafarers serve, and the examination records shall be well kept.The MOTC shall coordinate the central government authorities which are in charge of labor safety and sanitation to set down the stipulations concerning seafarers’ fitness and health examinations, as well as the requirements of the medical institutions.
中文原文 船員法第8條
船員應經體格檢查合格,並依規定領有船員服務手冊,始得在船上服務。
已在船上服務之船員,應接受定期健康檢查;經檢查不合格或拒不接受檢查者,不得在船上服務。
前項船員健康檢查費用,由雇用人負擔。
船員體格檢查及健康檢查,應由符合規定條件之醫療機構或本事業單位所設置醫療單位為之;其檢查紀錄應予保存。
船員體格檢查、健康檢查及醫療機構應符合之條件等相關事項之辦法,由主管機關會同中央勞動及衛生福利主管機關定之。

English translation for reference only; the Chinese text prevails. Not legal advice.