Find Medicare codes, including Adjustment Reason Codes and Services Decision Reason Codes, at the website of the Washington Publishing Company. Within the reference section of the site, links are available to each separate section of codes.
The Washington Publishing company credits ASC X12 with assistance in maintaining and developing the code system. The lists themselves are maintained by the Centers for Medicare and Medicaid Services, The National Uniform Claim Committee, and committees that meet during standing X12 meetings. Despite the fact that the lists are freely available and accessible, the codes are subject to copyright and must be credited appropriately if used in published work.