Enforcement Rules of the National Health Insurance Act Article 22

An insured person who meets one of the following qualifications specified in Item 2 of Subparagraph 6 of Paragraph 1 of Article 10 of the Act may register in this Insurance through his/her original group insurance applicant upon the consent of the original group insurance applicant, provided that the insurance premium shall be calculated separately according to Article 23 and Subparagraph 7 of Article 27 of the Act:1. A retired person2. A person who voluntarily continues the labor insurance in accordance with Article 9-1 of the Labor Insurance Act3. An initially group insured person who has to move out of its current registered residence and is sent overseas by the employer.
中文原文 全民健康保險法施行細則第22條
本法第十條第一項第六款第二目之被保險人符合下列情形之一者,經徵得原投保單位之同意,得以原投保單位為投保單位。
但其保險費仍應依本法第二十三條及第二十七條第七款規定分別計算:
一、為退休人員。
二、依勞工保險條例第九條之一規定自願繼續參加勞工保險。
三、原隨同投保之被保險人因工作派駐國外而遷出戶籍。

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