2c389a02__Specifications___openEHR_wiki__openEHR_equivalent
[0] 2 [Code mnemonic] NA [Rubric] not applicable [Description] No proper value is applicable in this context (e.g., last menstrual period for a male). [openEHR equivalent] 
(same in openEHR)
Null Flavours and Boolean data in openEHR - Specifications - openEHR wiki
openEHR equivalent