This code system http://hl7.org/fhir/v2/0919 defines the following codes:

CodeDisplayComments
DIn some cases, this test should be only exclusively with like tests (examples are cyto or pathology)When D is specified for this field, using field OM1-49 determines how tests must be grouped together. Tests within the same Diagnostic Service Sector may be on the same requisition, and therefore in the same message
NThis test can be included with any number of other testsDefault -.will be assumed when this field is empty
YThis test should be exclusive

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