Revenue codes are the codes that are used to identify the revenue that is earned by a company. These codes are used to track the sales and other income that is generated by the company. Revenue codes can be used to identify the type of revenue that is being generated, such as sales, fees, or other forms of income. They can also be used to track the sources of revenue, such as products or services sold, or the customers who generate the revenue. Revenue codes can also be used to track the timing of revenue, such as when revenue is earned or when it is received.