Before Version 12 (through 2009 diagnosis), date fields included codes that provided information other than dates. As part of an initiative to standardize date fields, new fields were introduced to accommodate non-date information that had previously been transmitted in date fields.

10	No information whatsoever can be inferred from this exceptional value (e.g, unknown if any diagnostic or staging procedure performed).
11	No proper value is applicable in this context (e.g., no diagnostic or staging procedure performed; autopsy only case).
12	A proper value is applicable but not known. This event occurred, but the date is unknown (e.g., diagnostic or staging procedure performed but date is unknown).
Blank	A valid date value is provided in item RX Date DX/Stg Proc [1280], or the date was not expected to have been transmitted.

Comment: This is part of the initiative of the transformation from the old NAACCR date standards to interoperable dates.