There are 3 forgery crimes in New York. The law of Forgery in New York does not place any more emphasis on falsely making, altering or completing a written instrument.The forgery provisions of the Penal Law are found in Article 170. There are three degrees each of forgery and criminal possession of a forged instrument. The three types of forgery are document forgery, signature forgery, and art forgery. Is forging a signature a felony? Blank Document Forgery. Filling out an empty document with false information is blank document forgery. What Are the Different Types of Criminal Forgery? Document Forgery: This involves the creation or alteration of documents such as contracts, wills, deeds, or financial instruments.