Concept Code	Concept Name	Preferred Concept Name	Code System
	ASKU	asked but unknown	asked but unknown	NullFlavor	Details
	DER	derived	derived	NullFlavor	Details
	INV	invalid	invalid	NullFlavor	Details
	MSK	masked	masked	NullFlavor	Details
	NINF	negative infinity	negative infinity	NullFlavor	Details
	NI	NoInformation	NoInformation	NullFlavor	Details
	NA	not applicable	not applicable	NullFlavor	Details
	NASK	not asked	not asked	NullFlavor	Details
	NP	not present	not present	NullFlavor	Details
	OTH	other	other	NullFlavor	Details
	PINF	positive infinity	positive infinity	NullFlavor	Details
	QS	Sufficient Quantity	Sufficient Quantity	NullFlavor	Details
	NAV	temporarily unavailable	temporarily unavailable	NullFlavor	Details
	TRC	trace	trace	NullFlavor	Details
	UNC	un-encoded	un-encoded	NullFlavor	Details