Legal analysis: The special bills for hospital charges can be understood as "invoices". There is a financial bill producer seal (producer of the Ministry of Finance) on it, which can be used as a legal and effective proof of reimbursement. The above applies to public non-profit hospitals. Legal basis: Measures of the People's Republic of China on the Administration of Invoices Article 10 Invoices shall be overprinted with the unified national invoice producer seal. The style of the unified national invoice producer seal and the requirements for invoice layout printing shall be stipulated by the competent tax department of the State Council. The invoice producer seal shall be made by the tax authorities of provinces, autonomous regions and municipalities directly under the Central Government. It is forbidden to forge the seal of invoice producer. The invoice shall be changed irregularly. Twentieth all units and individuals engaged in production and business activities in the purchase of goods, services and other business activities to pay, should obtain invoices from the payee. When obtaining an invoice, it is not allowed to change the name and amount.