This case-sensitive code system https://www.nubc.org/CodeSystem/RevenueCodes defines codes, but no codes are represented here
American Hospital Association (AHA); 155 North Wacker Drive, Suite 400, Chicago, IL 60606
"The UB-04 Data File contains the complete set of NUBC codes. Every code in the range of possible codes is accounted for sequentially. There are no gaps because all used and unused codes are identified." This code system consists of the following: \* FL 42 - Revenue Codes These codes are used to convey the revenue code and are the property of the American Hospital Association. To obtain the underlying code systems, please see information [here](https://www.nubc.org/subscription-information) Statement of Understanding between AHA and HL7 can be found [here](http://www.hl7.org/documentcenter/public/mou/AHA%20HL7%20SOU%202020%20AHA%20Fully%20Executed.pdf). In particular see sections 4.1d and 4.2. "The UB-04 Manual has a 12-month subscription period from June 30 through July 1." For frequently asked questions, see here [here](https://www.nubc.org/nubc-faqs)
Licensing information can be found [here](https://www.nubc.org/license) These codes are listed within the UB-04 Data Specifications Manual. The Official UB-04 Data Specifications Manual, copyrighted by the American Hospital Association, is the only official source of UB-04 billing information adopted by the National Uniform Billing Committee. No other publication—governmental or private/commercial—can be considered authoritative. The AHA wants to make you aware that the use of codes, descriptions, or any other content contained in the manual to be used in a software application, publication, or any other derivative work must be properly licensed by the AHA. If your organization uses or intends to use any of the codes or other related content from the manual in this manner, please contact the AHA’s licensing manager, Tim Carlson, at 312.893.6816 or tcarlson@aha.org