Enforcement Rules of the Labor Insurance Act Article 62

In the event that the insured persons are unable to provide the necessary documents within the ten days or before hospital discharge after receiving medical treatments as stipulated in the preceding article as the result of any circumstances not of their own faults, they shall prepare and submit the occupational injury or disease outpatient medical treatment bills or hospitalization application forms and the receipts of medical expenses prepared and issued by the medical service institutions affiliated with the national health insurance programs, within six months from the date of receiving outpatient medical treatment or the date of releasing from hospitalization, to the insurer responsible for the jurisdictional districts to apply for reimbursement of the paid medical expenses.
中文原文 勞工保險條例施行細則第62條
因不可歸責於被保險人之事由,未能依前條規定於就醫之日起十日內或出院前補送證件者,被保險人得於門診治療當日或出院之日起六個月內,檢附職業傷病門診就診單或住院申請書及全民健康保險特約醫院或診所開具之醫療費用單據,向保險人申請核退醫療費用。

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