This component species the units in which the quantity is expressed. Field-by-field,
default units may be defined within the specifications. When the quantity is measured
in the default units, the units need not be transmitted. If the quantity is recorded
in units different from the default, the units must be transmitted. Bevat 2.16.840.1.113883.3.1937.777.10.15.5CE - Coded element (DYNAMISCH)