• G • G • G Presumptive drug code: Drug test(s), presumptive, any number of drug classes, qualitative; any number of devices or procedures, (e.g., immunoassay) capable of read by direct optical observation only (e.g., dipstick, cups, cards. Nov 08, · G; for Quick Read Drug Screens For drug only one of the three presumptive codes (GG) may be reported per day. For definitive only one of the four definitive codes (GG) may be reported per day. The unit used to determine the correct definitive G code assignment is the drug class.
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