GCRT
\nRoute of Administration Code (1-character)
\na one-character alphanumeric column that provides the normal site or method by which a drug is administered, such as oral, injection, or topical. A GCRT is associated to each GCN_SEQNO to identify that component of the generic drug formulation.
\nThis code system http://terminology.hl7.org/CodeSystem/GCRT defines many codes, but they are not represented here