A laboratory utilizing LCMS to produce quantitative drug test result that is considered a definitive result would report from the definitive codes that were released for 2015 by the AMA. Medicare released HCPCS codes that they want used for certain codes instead which are listed also (G codes).
AMA Definitive Drug Class Procedures
80320 Alcohols
80321 Alcohol biomarkers; 1 or 2
80322 Alcohol biomarkers; 3 or more
80323 Alkaloids, not otherwise specified
80324 Amphetamines; 1 or 2
80325 Amphetamines; 3 or 4
80326 Amphetamines; 5 or more
80327 Anabolic steroids; 1 or 2
80328 Anabolic steroids; 3 or more
80329 Analgesics, non-opioid; 1 or 2
80330 Analgesics, non-opioid; 3-5
80331 Analgesics, non-opioid; 6 or more 1 or 2
80332 Antidepressants, serotonergic class;1 or 2
80333 Antidepressants, serotonergic class; 3-5
80334 Antidepressants, serotonergic class; 6 or more
80335 Antidepressants, tricyclic and other cyclicals; 1 or 2
80336 Antidepressants, tricyclic and other cyclicals; 3-5
80337 Antidepressants, tricyclic and other cyclicals; 6 or more
80338 Antidepressants, not otherwise specified
80339 Antiepileptics, not otherwise specified; 1-3
80340 Antiepileptics, not otherwise specified; 4-6
80341 Antiepileptics, not otherwise specified; 7 or more
80342 Antipsychotics, not otherwise specified; 1-3
80343 Antipsychotics, not otherwise specified; 4-6
80344 Antipsychotics, not otherwise specified; 7 or more
80345 Barbiturates
80346 Benzodiazepines; 1-12
80347 Benzodiazepines; 13 or more
80348 Buprenorphine
80349 Cannabinoids, natural
80350 Cannabinoids, synthetic; 1-3
80351 Cannabinoids, synthetic; 4-6
80352 Cannabinoids, synthetic; 7 or more
80353 Cocaine
80354 Fentanyl
80355 Gabapentin, non-blood
80356 Heroin metabolite
80357 Ketamine and norketamine
80358 Methadone
80359 Methylenedioxyamphetamines (MDA, MDEA, MDMA)
80360 Methylphenidate
80361 Opiates, 1 or more
80362 Opioids and opiate analogs; 1 or 2
80363 Opioids and Opiate analogs; 3 or 4
80364 Opioids and Opiate analogs; 5 or more
80365 Oxycodone
80366 Pregabalin
80367 Propoxyphene
80368 Sedative hypnotics (non-benzodiazepines)
80369 Skeletal muscle relaxants; 1 or 2
80370 Skeletal muscle relaxants; 3 or more
80371 Stimulants, synthetic
80372 Tapentadol
80373 Tramadol
80374 Stereoisomer (enantiomer) analysis, single drug class
80375 Drug(s) or substance(s), definitive, qualitative or quantitative, not otherwise specified; 1-3
80376 Drug(s) or substance(s), definitive, qualitative or quantitative, not otherwise specified; 4-6
80377 Drug(s) or substance(s), definitive, qualitative or quantitative, not otherwise specified; 7 or more
Release by Medicare for 2015
G6030 Amitriptyline Assay of amitriptyline
G6031 Benzodiazepines Assay of benzodiazepines
G6032 Desipramine Assay of desipramine
G6034 Doxepin Assay of doxepin
G6035 Gold Assay of gold
G6036Assay of imipramine Assay of imipramine
G6037 Nortriptyline Assay of nortiptyline
G6038 Salicylate Assay of salicylate
G6039 Acetaminophen Assay of acetaminophen
G6040 Alcohol (ethanol); any specimen except breath Assay of ethanol
G6041 Alkaloids, urine, quantitative Assay of urine alkaloids
G6042 Amphetamine or methamphetamine Assay of amphetamines
G6043Barbiturates, not elsewhere specified Assay of barbiturates
G6044 Cocaine or metabolite Assay of cocaine
G6045 Dihydrocodeinone
G6046 Dihydromorphinone Assay of dihydromorphinone
G6047 Dihydrotestosterone Assay of dihydrotestosterone
G6048 Dimethadione Assay of dimethadione
G6049 Epiandrosterone Asssay of epiandrosterone
G6050 Ethchlorvynol Assay of ethchlorvynol
G6051 Flurazepam Assay of flurazepam
G6052 Meprobamate Assay of meprobamate
G6053 Methadone Assay of methadone
G6054 Methsuximide Assay of methsuximide
G6055 Nicotine Assay of nicotine
G6056 Opiate(s), drug and metabolites, each procedure
Assay of opiates
G6057 Phenothiazine Assay of phenothiazine
G6058 Drug confirmation, each procedure