The list below shows the federal regulations and notices for the Hospital Outpatient Prospective Payment System.
| HCFA-1005-FC | April 7, 2000 - Hospital outpatient services; prospective payment system, 18433-18820 | 2000 |
| CMS-1159-P | August 24, 2001 - Changes to the OPPS System and Calendar Year 2002 Payment Rates | 2002 |
| CMS-1471-P | August 6, 2003 - Changes to the Hospital Outpatient PPS and Calendar Year 2004 Payment Rates | 2004 |
| CMS-1206-P | August 9, 2002 - Changes to the Hospital Outpatient PPS and Calendar Year 2003 Payment Rates | 2003 |
| CMS-1471-CN | Changes to the Hospital Outpatient PPS and Calendar Year 2004 Payment Rates | 2004 |
| CMS-1427-CN | Changes to the Hospital Outpatient PPS and Calendar Year 2005 Payment Rates | 2005 |
| CMS-1471-FC | Changes to the Hospital Outpatient PPS for Calendar Year 2004 | 2004 |
| CMS-1427-P | Changes to the Hospital Outpatient PPS for Calendar Year 2005 | 2005 |
| CMS-1427-FC | Changes to the Hospital Outpatient PPS for Calendar Year 2005 | 2005 |
| CMS-1501-FC | Changes to the Hospital Outpatient PPS for Calendar Year 2006 | 2006 |