2024 ICD-10-CM Table of Drugs and Chemicals starting with letter L

The 2024 Table of Drugs and Chemicals contains a classification of drugs, industrial solvents, corrosive gases, noxious plants, pesticides, and other toxic agents. Each substance in the table is assigned a code according to the poisoning classification and external causes of adverse effects. Use as many codes as necessary to describe all reported drugs, medicinal or chemical substances. Browse Table of Drugs and Chemicals by alphabetical order:

Substance Poisoning
Accidental
(unintentional)
Poisoning
Accidental
self-harm
Poisoning
Assault
Poisoning
Undetermined
Adverse
effect
Underdosing
LabetalolT44.8X1T44.8X2T44.8X3T44.8X4T44.8X5T44.8X6
Laburnum (seeds)T62.2X1T62.2X2T62.2X3T62.2X4  
Laburnum (seeds)
  »leaves
T62.2X1T62.2X2T62.2X3T62.2X4  
LachesineT49.5X1T49.5X2T49.5X3T49.5X4T49.5X5T49.5X6
LacidipineT46.5X1T46.5X2T46.5X3T46.5X4T46.5X5T46.5X6
LacquerT65.6X1T65.6X2T65.6X3T65.6X4  
Lacrimogenic gasT59.3X1T59.3X2T59.3X3T59.3X4  
Lactated potassic salineT50.3X1T50.3X2T50.3X3T50.3X4T50.3X5T50.3X6
Lactic acidT49.8X1T49.8X2T49.8X3T49.8X4T49.8X5T49.8X6
LactobacillusT47.6X1T47.6X2T47.6X3T47.6X4T47.6X5T47.6X6
Lactobacillus
  »acidophilus
T47.6X1T47.6X2T47.6X3T47.6X4T47.6X5T47.6X6
Lactobacillus
  »acidophilus
    »compound
T47.6X1T47.6X2T47.6X3T47.6X4T47.6X5T47.6X6
Lactobacillus
  »bifidus, lyophilized
T47.6X1T47.6X2T47.6X3T47.6X4T47.6X5T47.6X6
Lactobacillus
  »bulgaricus
T47.6X1T47.6X2T47.6X3T47.6X4T47.6X5T47.6X6
Lactobacillus
  »sporogenes
T47.6X1T47.6X2T47.6X3T47.6X4T47.6X5T47.6X6
LactoflavinT45.2X1T45.2X2T45.2X3T45.2X4T45.2X5T45.2X6
Lactose (as excipient)T50.901T50.902T50.903T50.904T50.905T50.906
Lactuca (virosa) (extract)T42.6X1T42.6X2T42.6X3T42.6X4T42.6X5T42.6X6
LactucariumT42.6X1T42.6X2T42.6X3T42.6X4T42.6X5T42.6X6
LactuloseT47.3X1T47.3X2T47.3X3T47.3X4T47.3X5T47.3X6
LanatosidesT46.0X1T46.0X2T46.0X3T46.0X4T46.0X5T46.0X6
LanolinT49.3X1T49.3X2T49.3X3T49.3X4T49.3X5T49.3X6
LargactilT43.3X1T43.3X2T43.3X3T43.3X4T43.3X5T43.3X6
LarkspurT62.2X1T62.2X2T62.2X3T62.2X4  
LaroxylT43.011T43.012T43.013T43.014T43.015T43.016
LasixT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
Lassar's pasteT49.4X1T49.4X2T49.4X3T49.4X4T49.4X5T49.4X6
LatamoxefT36.1X1T36.1X2T36.1X3T36.1X4T36.1X5T36.1X6
LatexT65.811T65.812T65.813T65.814  
Lathyrus (seed)T62.2X1T62.2X2T62.2X3T62.2X4  
LaudanumT40.0X1T40.0X2T40.0X3T40.0X4T40.0X5T40.0X6
LaudexiumT48.1X1T48.1X2T48.1X3T48.1X4T48.1X5T48.1X6
Laughing gasT41.0X1T41.0X2T41.0X3T41.0X4T41.0X5T41.0X6
Laurel, black or cherryT62.2X1T62.2X2T62.2X3T62.2X4  
LauroliniumT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
Lauryl sulfoacetateT49.2X1T49.2X2T49.2X3T49.2X4T49.2X5T49.2X6
Laxative NECT47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
Laxative NEC
  »osmotic
T47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
Laxative NEC
  »saline
T47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
Laxative NEC
  »stimulant
T47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
L-dopaT42.8X1T42.8X2T42.8X3T42.8X4T42.8X5T42.8X6
Lead (dust) (fumes) (vapor) NECT56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »acetate
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »alkyl (fuel additive)
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »anti-infectives
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »antiknock compound (tetraethyl)
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »arsenate, arsenite (dust) (herbicide) (insecticide) (vapor)
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »carbonate
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »carbonate
    »paint
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »chromate
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »chromate
    »paint
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »dioxide
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »inorganic
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »iodide
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »iodide
    »pigment (paint)
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »monoxide (dust)
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »monoxide (dust)
    »paint
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »organic
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »oxide
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »oxide
    »paint
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »paint
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »salts
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »specified compound NEC
T56.0X1T56.0X2T56.0X3T56.0X4  
Lead (dust) (fumes) (vapor) NEC
  »tetra-ethyl
T56.0X1T56.0X2T56.0X3T56.0X4  
Lebanese redT40.711T40.712T40.713T40.714T40.715T40.716
LefetamineT39.8X1T39.8X2T39.8X3T39.8X4T39.8X5T39.8X6
LenperoneT43.4X1T43.4X2T43.4X3T43.4X4T43.4X5T43.4X6
Lente lietin (insulin)T38.3X1T38.3X2T38.3X3T38.3X4T38.3X5T38.3X6
LeptazolT50.7X1T50.7X2T50.7X3T50.7X4T50.7X5T50.7X6
LeptophosT60.0X1T60.0X2T60.0X3T60.0X4  
LeritineT40.2X1T40.2X2T40.2X3T40.2X4T40.2X5T40.2X6
LetosteineT48.4X1T48.4X2T48.4X3T48.4X4T48.4X5T48.4X6
LetterT38.1X1T38.1X2T38.1X3T38.1X4T38.1X5T38.1X6
Lettuce opiumT42.6X1T42.6X2T42.6X3T42.6X4T42.6X5T42.6X6
LeucinocaineT41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
LeucocianidolT46.991T46.992T46.993T46.994T46.995T46.996
Leucovorin (factor)T45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
LeukeranT45.1X1T45.1X2T45.1X3T45.1X4T45.1X5T45.1X6
LeuprolideT38.891T38.892T38.893T38.894T38.895T38.896
LevalbuterolT48.6X1T48.6X2T48.6X3T48.6X4T48.6X5T48.6X6
LevallorphanT50.7X1T50.7X2T50.7X3T50.7X4T50.7X5T50.7X6
LevamisoleT37.4X1T37.4X2T37.4X3T37.4X4T37.4X5T37.4X6
LevanilT42.6X1T42.6X2T42.6X3T42.6X4T42.6X5T42.6X6
LevarterenolT44.4X1T44.4X2T44.4X3T44.4X4T44.4X5T44.4X6
LevdropropizineT48.3X1T48.3X2T48.3X3T48.3X4T48.3X5T48.3X6
LevobunololT49.5X1T49.5X2T49.5X3T49.5X4T49.5X5T49.5X6
Levocabastine (hydrochloride)T45.0X1T45.0X2T45.0X3T45.0X4T45.0X5T45.0X6
LevocarnitineT50.991T50.992T50.993T50.994T50.995T50.996
LevodopaT42.8X1T42.8X2T42.8X3T42.8X4T42.8X5T42.8X6
Levodopa
  »with carbidopa
T42.8X1T42.8X2T42.8X3T42.8X4T42.8X5T42.8X6
Levo-dromoranT40.2X1T40.2X2T40.2X3T40.2X4T40.2X5T40.2X6
LevoglutamideT50.991T50.992T50.993T50.994T50.995T50.996
LevoidT38.1X1T38.1X2T38.1X3T38.1X4T38.1X5T38.1X6
Levo-iso-methadoneT40.3X1T40.3X2T40.3X3T40.3X4T40.3X5T40.3X6
LevomepromazineT43.3X1T43.3X2T43.3X3T43.3X4T43.3X5T43.3X6
LevonordefrinT49.6X1T49.6X2T49.6X3T49.6X4T49.6X5T49.6X6
LevonorgestrelT38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
Levonorgestrel
  »with ethinylestradiol
T38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
LevopromazineT43.3X1T43.3X2T43.3X3T43.3X4T43.3X5T43.3X6
LevopromeT42.6X1T42.6X2T42.6X3T42.6X4T42.6X5T42.6X6
LevopropoxypheneT40.491T40.492T40.493T40.494T40.495T40.496
LevopropylhexedrineT50.5X1T50.5X2T50.5X3T50.5X4T50.5X5T50.5X6
LevoproxyphyllineT48.6X1T48.6X2T48.6X3T48.6X4T48.6X5T48.6X6
LevorphanolT40.491T40.492T40.493T40.494T40.495T40.496
LevothyroxineT38.1X1T38.1X2T38.1X3T38.1X4T38.1X5T38.1X6
Levothyroxine
  »sodium
T38.1X1T38.1X2T38.1X3T38.1X4T38.1X5T38.1X6
LevsinT44.3X1T44.3X2T44.3X3T44.3X4T44.3X5T44.3X6
LevuloseT50.3X1T50.3X2T50.3X3T50.3X4T50.3X5T50.3X6
Lewisite (gas), not in warT57.0X1T57.0X2T57.0X3T57.0X4  
LibriumT42.4X1T42.4X2T42.4X3T42.4X4T42.4X5T42.4X6
LidexT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
LidocaineT41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Lidocaine
  »regional
T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Lidocaine
  »spinal
T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
LidofeninT50.8X1T50.8X2T50.8X3T50.8X4T50.8X5T50.8X6
LidoflazineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
Lighter fluidT52.0X1T52.0X2T52.0X3T52.0X4  
Lignin hemicelluloseT47.6X1T47.6X2T47.6X3T47.6X4T47.6X5T47.6X6
LignocaineT41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Lignocaine
  »regional
T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Lignocaine
  »spinal
T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Ligroin (e) (solvent)T52.0X1T52.0X2T52.0X3T52.0X4  
Ligroin (e) (solvent)
  »vapor
T52.0X1T52.0X2T52.0X3T52.0X4  
Ligustrum vulgareT62.2X1T62.2X2T62.2X3T62.2X4  
Lily of the valleyT62.2X1T62.2X2T62.2X3T62.2X4  
Lime (chloride)T54.3X1T54.3X2T54.3X3T54.3X4  
LimoneneT52.8X1T52.8X2T52.8X3T52.8X4  
LincomycinT36.8X1T36.8X2T36.8X3T36.8X4T36.8X5T36.8X6
Lindane (insecticide) (nonmedicinal) (vapor)T53.6X1T53.6X2T53.6X3T53.6X4  
Lindane (insecticide) (nonmedicinal) (vapor)
  »medicinal
T53.6X1T53.6X2T53.6X3T53.6X4  
Liniments NECT49.91T49.92T49.93T49.94T49.95T49.96
Linoleic acidT46.6X1T46.6X2T46.6X3T46.6X4T46.6X5T46.6X6
Linolenic acidT46.6X1T46.6X2T46.6X3T46.6X4T46.6X5T46.6X6
LinseedT47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
LiothyronineT38.1X1T38.1X2T38.1X3T38.1X4T38.1X5T38.1X6
LiotrixT38.1X1T38.1X2T38.1X3T38.1X4T38.1X5T38.1X6
LipancreatinT47.5X1T47.5X2T47.5X3T47.5X4T47.5X5T47.5X6
Lipo-alprostadilT46.7X1T46.7X2T46.7X3T46.7X4T46.7X5T46.7X6
Lipo-LutinT38.5X1T38.5X2T38.5X3T38.5X4T38.5X5T38.5X6
Lipotropic drug NECT50.901T50.902T50.903T50.904T50.905T50.906
Liquefied petroleum gasesT59.891T59.892T59.893T59.894  
Liquefied petroleum gases
  »piped (pure or mixed with air)
T59.891T59.892T59.893T59.894  
LiquidT47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
Liquid
  »paraffin
T47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
Liquid
  »petrolatum
T47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
Liquid
  »petrolatum
    »topical
T47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
Liquid
  »specified NEC
T47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
Liquid
  »substance
T47.4X1T47.4X2T47.4X3T47.4X4T47.4X5T47.4X6
Liquor creosolis compositusT65.891T65.892T65.893T65.894  
LiquoriceT48.4X1T48.4X2T48.4X3T48.4X4T48.4X5T48.4X6
Liquorice
  »extract
T48.4X1T48.4X2T48.4X3T48.4X4T48.4X5T48.4X6
LisinoprilT46.4X1T46.4X2T46.4X3T46.4X4T46.4X5T46.4X6
LisurideT42.8X1T42.8X2T42.8X3T42.8X4T42.8X5T42.8X6
LithaneT43.8X1T43.8X2T43.8X3T43.8X4T43.8X5T43.8X6
LithiumT56.891T56.892T56.893T56.894  
Lithium
  »gluconate
T56.891T56.892T56.893T56.894  
Lithium
  »salts (carbonate)
T56.891T56.892T56.893T56.894  
LithonateT43.8X1T43.8X2T43.8X3T43.8X4T43.8X5T43.8X6
LiverT45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
Liver
  »extract
T45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
Liver
  »extract
    »for parenteral use
T45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
Liver
  »fraction 1
T45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
Liver
  »hydrolysate
T45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
Lizard (bite) (venom)T63.121T63.122T63.123T63.124  
LMDT45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
LobeliaT62.2X1T62.2X2T62.2X3T62.2X4  
LobelineT50.7X1T50.7X2T50.7X3T50.7X4T50.7X5T50.7X6
Local action drug NECT49.8X1T49.8X2T49.8X3T49.8X4T49.8X5T49.8X6
LocortenT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
LofepramineT43.011T43.012T43.013T43.014T43.015T43.016
Lolium temulentumT62.2X1T62.2X2T62.2X3T62.2X4  
LomotilT47.6X1T47.6X2T47.6X3T47.6X4T47.6X5T47.6X6
LomustineT45.1X1T45.1X2T45.1X3T45.1X4T45.1X5T45.1X6
LonidamineT45.1X1T45.1X2T45.1X3T45.1X4T45.1X5T45.1X6
LoperamideT47.6X1T47.6X2T47.6X3T47.6X4T47.6X5T47.6X6
LoprazolamT42.4X1T42.4X2T42.4X3T42.4X4T42.4X5T42.4X6
LorajmineT46.2X1T46.2X2T46.2X3T46.2X4T46.2X5T46.2X6
LoratidineT45.0X1T45.0X2T45.0X3T45.0X4T45.0X5T45.0X6
LorazepamT42.4X1T42.4X2T42.4X3T42.4X4T42.4X5T42.4X6
LorcainideT46.2X1T46.2X2T46.2X3T46.2X4T46.2X5T46.2X6
LormetazepamT42.4X1T42.4X2T42.4X3T42.4X4T42.4X5T42.4X6
Lotions NECT49.91T49.92T49.93T49.94T49.95T49.96
LotusateT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
LovastatinT46.6X1T46.6X2T46.6X3T46.6X4T46.6X5T46.6X6
LowilaT49.2X1T49.2X2T49.2X3T49.2X4T49.2X5T49.2X6
LoxapineT43.591T43.592T43.593T43.594T43.595T43.596
Lozenges (throat)T49.6X1T49.6X2T49.6X3T49.6X4T49.6X5T49.6X6
LSDT40.8X1T40.8X2T40.8X3T40.8X4  
Lubricant, eyeT49.5X1T49.5X2T49.5X3T49.5X4T49.5X5T49.5X6
Lubricating oil NECT52.0X1T52.0X2T52.0X3T52.0X4  
LucanthoneT37.4X1T37.4X2T37.4X3T37.4X4T37.4X5T37.4X6
LuminalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Lung irritant (gas) NECT59.91T59.92T59.93T59.94  
Luteinizing hormoneT38.811T38.812T38.813T38.814T38.815T38.816
LutocylolT38.5X1T38.5X2T38.5X3T38.5X4T38.5X5T38.5X6
LutromoneT38.5X1T38.5X2T38.5X3T38.5X4T38.5X5T38.5X6
LututrinT48.291T48.292T48.293T48.294T48.295T48.296
Lye (concentrated)T54.3X1T54.3X2T54.3X3T54.3X4  
Lygranum (skin test)T50.8X1T50.8X2T50.8X3T50.8X4T50.8X5T50.8X6
LymecyclineT36.4X1T36.4X2T36.4X3T36.4X4T36.4X5T36.4X6
Lymphogranuloma venereum antigenT50.8X1T50.8X2T50.8X3T50.8X4T50.8X5T50.8X6
LynestrenolT38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
Lyovac Sodium EdecrinT50.1X1T50.1X2T50.1X3T50.1X4T50.1X5T50.1X6
LypressinT38.891T38.892T38.893T38.894T38.895T38.896
Lysergic acid diethylamideT40.8X1T40.8X2T40.8X3T40.8X4  
LysergideT40.8X1T40.8X2T40.8X3T40.8X4  
Lysine vasopressinT38.891T38.892T38.893T38.894T38.895T38.896
LysolT54.1X1T54.1X2T54.1X3T54.1X4  
LysozymeT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
Lytta (vitatta)T49.8X1T49.8X2T49.8X3T49.8X4T49.8X5T49.8X6

Coding Guidelines Table of Drugs and Chemicals

The Codes in categories T36 - T65 are combination codes that include the substance that was taken as well as the intent. No additional external cause code is required for poisonings, toxic effects, adverse effects and underdosing codes.

  • Do not code directly from the Table of Drugs and Chemicals. Always refer back to the Tabular List.
  • Use as many codes as necessary to describe completely all drugs, medicinal or biological substances.
  • If the same code would describe the causative agent for more than one adverse reaction, poisoning, toxic effect or underdosing, assign the code only once.
  • If two or more drugs, medicinal or biological substances are reported, code each individually unless a combination code is listed in the Table of Drugs and Chemicals.

(a) Adverse Effect

When coding an adverse effect of a drug that has been correctly prescribed and properly administered, assign the appropriate code for the nature of the adverse effect followed by the appropriate code for the adverse effect of the drug (T36-T50). The code for the drug should have a 5th or 6th character "5" (for example T36.0X5-) Examples of the nature of an adverse effect are tachycardia, delirium, gastrointestinal hemorrhaging, vomiting, hypokalemia, hepatitis, renal failure, or respiratory failure.

(b) Poisoning

When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined. If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.

If there is also a diagnosis of abuse or dependence of the substance, the abuse or dependence is assigned as an additional code.

Examples of poisoning include:

  • (i) Error was made in drug prescription. Errors made in drug prescription or in the administration of the drug by provider, nurse, patient, or other person.
  • (ii) Overdose of a drug intentionally taken. If an overdose of a drug was intentionally taken or administered and resulted in drug toxicity, it would be coded as a poisoning.
  • (iii)Nonprescribed drug taken with correctly prescribed and properly administered drug. If a nonprescribed drug or medicinal agent was taken in combination with a correctly prescribed and properly administered drug, any drug toxicity or other reaction resulting from the interaction of the two drugs would be classified as a poisoning.
  • (iv) Interaction of drug(s) and alcohol. When a reaction results from the interaction of a drug(s) and alcohol, this would be classified as poisoning.

See Section I.C.4. if poisoning is the result of insulin pump malfunctions.

(c) Underdosing

Underdosing refers to taking less of a medication than is prescribed by a provider or a manufacturer's instruction. For underdosing, assign the code from categories T36-T50 (fifth or sixth character "6").

Codes for underdosing should never be assigned as principal or first-listed codes. If a patient has a relapse or exacerbation of the medical condition for which the drug is prescribed because of the reduction in dose, then the medical condition itself should be coded.

Noncompliance (Z91.12-, Z91.13-) or complication of care (Y63.6-Y63.9) codes are to be used with an underdosing code to indicate intent, if known.

(d) Toxic Effects

When a harmful substance is ingested or comes in contact with a person, this is classified as a toxic effect. The toxic effect codes are in categories T51-T65. Toxic effect codes have an associated intent: accidental, intentional self-harm, assault and undetermined.