The following codes are to be used for qualitative instrumental methods:
- 80100 DRUG SCREEN: multiple classes, each procedure
- 80101 DRUG SCREEN: single class, each procedure
- 80102 DRUG CONFIRMATION: each procedure
CPT code 80100 or 80101 is used for the initial screen, depending on whether the method detects multiple classes or a single class of drugs. Each confirmatory identification procedure is coded separately using 80102. These codes may be used in addition to the codes listed in the Therapeutic Drug Assay section of the CPT if the drug(s) determined qualitatively is subsequently quantified.
For example, an overdose of phenobarbital is suspected after obtaining a positive result for a urine screen for barbiturates. A quantitative serum assay for phenobarbital is then performed. Coding would be as follows:
- 80101 DRUG SCREEN: single class (Barbiturates)
- 80184 PHENOBARBITAL