Regulations Governing the National Health Insurance Medical Care Article 16

A contracted medical care institution provide medical care to insured patients involving hospitalization costs that patients must bear themselves under Article 47 of the Act, or non-reimbursable items or circumstances stipulated in Article 51 or Article 53, they shall inform the beneficiary in advance.
中文原文 全民健康保險醫療辦法第16條
保險醫事服務機構診療保險對象,有本法第四十七條應自行負擔之住院費用,第五十一條或第五十三條規定不給付項目或情形者,應事先告知保險對象。

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