Collaborative Stage Data Set - Revised 11/12/2010 FINAL
| Code | Description |
| 000 | No history of leukemia |
| 010 | History of leukemia |
| 988 | Not applicable: Information not collected for this case (If this information is required by your standard setter, use of code 988 may result in an edit error.) |
| 999 | Unknown or no information Not documented in patient record |