Mental Health Act Article 35

In the medical certificate referred to in Paragraph 1 of the preceding Article, the valid period of one to three years shall be recorded.Before the expiration of the period referred to in the preceding Paragraph, if the severe patients or their protectors believe that their condition has stabilized and a specialist physician has diagnosed and recognized that they are no longer severe patients, the institution where the diagnosing physician practices shall immediately notify the protector and report to the local competent authority.Before the expiration of the medical certificate for severe patients, the protector shall assist the patient in obtaining a diagnosis from a specialist physician to confirm their status as severe patients. If the diagnosis is not confirmed upon expiration, the diagnosis certificate shall no longer be valid.
中文原文 精神衛生法第35條
前條第一項診斷證明書,應記載一年至三年之有效期間。
前項期間屆滿前,嚴重病人或其保護人認其病情穩定,經專科醫師診斷,認定已非屬嚴重病人時,該診斷醫師執業之機構,應即通知保護人,並通報地方主管機關。
嚴重病人診斷證明書有效期間屆滿前,保護人應協助其接受專科醫師診斷,確認其嚴重病人身分;期間屆滿時,未經診斷確認者,其診斷證明書失其效力。

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