G0478 HCPCS - DRUG TEST(S), PRESUMPTIVE, ANY NUMBER OF DRUG CLASSES; ANY NUMBER OF DEVICES OR PROCEDURES, (E.G., IMMUNOASSAY) READ BY INSTRUMENT-ASSISTED DIRECT OPTICAL OBSERVATION (E.G., DIPSTICKS, CUPS, CARDS, CARTRIDGES), INCLUDES SAMPLE VALIDATION WHEN PERFORMED, PER DATE OF SERVICE