New York Expert Order with Retainer Paid by Party is a process available in New York state courts in which an expert opinion is requested by a party in a case, and the party pays a retainer fee to the expert in advance to secure the expert's services. This is in contrast to the usual expert witness process, in which the expert is paid only after providing testimony. There are two types of New York Expert Order with Retainer Paid by Party: one for medical expert witnesses and one for non-medical expert witnesses. Medical expert witnesses are typically hired to provide opinions regarding medical malpractice, while non-medical expert witnesses may provide opinions in a variety of other fields, such as business, engineering, and accounting. In both cases, the party requesting the expert opinion must submit an application to the court and pay a retainer fee to the expert in advance. The court then reviews the application and issues an expert order, authorizing the expert to provide an opinion. The expert then prepares a report for the court and may be called to testify in court.