A person commits forgery if, with intent to defraud, the person: 1. Falsely makes, completes or alters a written instrument; or 2.ARS § 13-2002 defines Arizona's forgery law. If you are facing forgery charges in Phoenix, AZ you need an experienced lawyer to fight for you. Call our team today at (602) 548-3400. In Arizona, a written instrument may be considered a forged instrument if it has an altered dollar figure or other material information. Forgery is a Class 4 felony in Arizona, which means a conviction can carry significant penalties, including imprisonment and fines.