Alternate Name	Item#	Length	Source of Standard	Column #
	1681	2	NAACCR	1753-1754

Description
This flag explains why no appropriate value is in the field, Subsq RX 3rd Course Date [1680]. This data item was first available in Volume II Version 12.

Rationale
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.

Codes (See Appendix H for the Flavors of Null table in its entirety which includes the NAACCR codes, HL7 codes and definitions.)

10	No information whatsoever can be inferred from this exceptional value (e.g., unknown if any subsequent therapy)
11	No proper value is applicable in this context (e.g., no subsequent therapy)
Blank	A valid date value is provided in item Subsq RX 3rd Course Date [1680], 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.