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

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
NabiloneT40.711T40.712T40.713T40.714T40.715T40.716
NabumetoneT39.391T39.392T39.393T39.394T39.395T39.396
NadololT44.7X1T44.7X2T44.7X3T44.7X4T44.7X5T44.7X6
NafcillinT36.0X1T36.0X2T36.0X3T36.0X4T36.0X5T36.0X6
NafoxidineT38.6X1T38.6X2T38.6X3T38.6X4T38.6X5T38.6X6
NaftazoneT46.991T46.992T46.993T46.994T46.995T46.996
Naftidrofuryl (oxalate)T46.7X1T46.7X2T46.7X3T46.7X4T46.7X5T46.7X6
NaftifineT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
Nail polish removerT52.91T52.92T52.93T52.94  
NalbuphineT40.491T40.492T40.493T40.494T40.495T40.496
NaledT60.0X1T60.0X2T60.0X3T60.0X4  
Nalidixic acidT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
NalorphineT50.7X1T50.7X2T50.7X3T50.7X4T50.7X5T50.7X6
NaloxoneT50.7X1T50.7X2T50.7X3T50.7X4T50.7X5T50.7X6
NaltrexoneT50.7X1T50.7X2T50.7X3T50.7X4T50.7X5T50.7X6
NamendaT43.8X1T43.8X2T43.8X3T43.8X4T43.8X5T43.8X6
NandroloneT38.7X1T38.7X2T38.7X3T38.7X4T38.7X5T38.7X6
NaphazolineT48.5X1T48.5X2T48.5X3T48.5X4T48.5X5T48.5X6
Naphtha (painters') (petroleum)T52.0X1T52.0X2T52.0X3T52.0X4  
Naphtha (painters') (petroleum)
  »solvent
T52.0X1T52.0X2T52.0X3T52.0X4  
Naphtha (painters') (petroleum)
  »vapor
T52.0X1T52.0X2T52.0X3T52.0X4  
Naphthalene (non-chlorinated)T60.2X1T60.2X2T60.2X3T60.2X4  
Naphthalene (non-chlorinated)
  »chlorinated
T60.2X1T60.2X2T60.2X3T60.2X4  
Naphthalene (non-chlorinated)
  »chlorinated
    »vapor
T60.2X1T60.2X2T60.2X3T60.2X4  
Naphthalene (non-chlorinated)
  »insecticide or moth repellent
T60.2X1T60.2X2T60.2X3T60.2X4  
Naphthalene (non-chlorinated)
  »insecticide or moth repellent
    »chlorinated
T60.2X1T60.2X2T60.2X3T60.2X4  
Naphthalene (non-chlorinated)
  »vapor
T60.2X1T60.2X2T60.2X3T60.2X4  
Naphthalene (non-chlorinated)
  »vapor
    »chlorinated
T60.2X1T60.2X2T60.2X3T60.2X4  
NaphtholT65.891T65.892T65.893T65.894  
NaphthylamineT65.891T65.892T65.893T65.894  
Naphthylthiourea (ANTU)T60.4X1T60.4X2T60.4X3T60.4X4  
NaproxenT39.311T39.312T39.313T39.314T39.315T39.316
Narcotic (drug)T40.601T40.602T40.603T40.604T40.605T40.606
Narcotic (drug)
  »analgesic NEC
T40.601T40.602T40.603T40.604T40.605T40.606
Narcotic (drug)
  »antagonist
T40.601T40.602T40.603T40.604T40.605T40.606
Narcotic (drug)
  »specified NEC
T40.601T40.602T40.603T40.604T40.605T40.606
Narcotic (drug)
  »synthetic
T40.601T40.602T40.603T40.604T40.605T40.606
NarcotineT48.3X1T48.3X2T48.3X3T48.3X4T48.3X5T48.3X6
NardilT43.1X1T43.1X2T43.1X3T43.1X4T43.1X5T43.1X6
Nasal drug NECT49.6X1T49.6X2T49.6X3T49.6X4T49.6X5T49.6X6
NatamycinT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
NaturalT45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
Natural
  »blood (product)
T45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
Natural
  »gas (piped)
T45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
Natural
  »gas (piped)
    »incomplete combustion
T45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
NealbarbitalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NectadonT48.3X1T48.3X2T48.3X3T48.3X4T48.3X5T48.3X6
NedocromilT48.6X1T48.6X2T48.6X3T48.6X4T48.6X5T48.6X6
NefopamT39.8X1T39.8X2T39.8X3T39.8X4T39.8X5T39.8X6
Nematocyst (sting)T63.691T63.692T63.693T63.694  
NembutalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NemonaprideT43.591T43.592T43.593T43.594T43.595T43.596
NeoarsphenamineT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
NeocinchophenT50.4X1T50.4X2T50.4X3T50.4X4T50.4X5T50.4X6
Neomycin (derivatives)T36.5X1T36.5X2T36.5X3T36.5X4T36.5X5T36.5X6
Neomycin (derivatives)
  »ENT agent
T36.5X1T36.5X2T36.5X3T36.5X4T36.5X5T36.5X6
Neomycin (derivatives)
  »ophthalmic preparation
T36.5X1T36.5X2T36.5X3T36.5X4T36.5X5T36.5X6
Neomycin (derivatives)
  »topical NEC
T36.5X1T36.5X2T36.5X3T36.5X4T36.5X5T36.5X6
Neomycin (derivatives)
  »with
T36.5X1T36.5X2T36.5X3T36.5X4T36.5X5T36.5X6
Neomycin (derivatives)
  »with
    »bacitracin
T36.5X1T36.5X2T36.5X3T36.5X4T36.5X5T36.5X6
Neomycin (derivatives)
  »with
    »neostigmine
T36.5X1T36.5X2T36.5X3T36.5X4T36.5X5T36.5X6
NeonalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NeoprontosilT37.0X1T37.0X2T37.0X3T37.0X4T37.0X5T37.0X6
NeosalvarsanT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
NeosilversalvarsanT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
NeosporinT36.8X1T36.8X2T36.8X3T36.8X4T36.8X5T36.8X6
Neosporin
  »ENT agent
T36.8X1T36.8X2T36.8X3T36.8X4T36.8X5T36.8X6
Neosporin
  »opthalmic preparation
T36.8X1T36.8X2T36.8X3T36.8X4T36.8X5T36.8X6
Neosporin
  »topical NEC
T36.8X1T36.8X2T36.8X3T36.8X4T36.8X5T36.8X6
Neostigmine bromideT44.0X1T44.0X2T44.0X3T44.0X4T44.0X5T44.0X6
NeravalT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NeravanT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Nerium oleanderT62.2X1T62.2X2T62.2X3T62.2X4  
Nerve gas, not in warT59.91T59.92T59.93T59.94  
NesacaineT41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Nesacaine
  »infiltration (subcutaneous)
T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Nesacaine
  »nerve block (peripheral) (plexus)
T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
NetilmicinT36.5X1T36.5X2T36.5X3T36.5X4T36.5X5T36.5X6
NeurobarbT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Neuroleptic drug NECT43.501T43.502T43.503T43.504T43.505T43.506
Neuromuscular blocking drugT48.1X1T48.1X2T48.1X3T48.1X4T48.1X5T48.1X6
Neutral insulin injectionT38.3X1T38.3X2T38.3X3T38.3X4T38.3X5T38.3X6
Neutral spiritsT51.0X1T51.0X2T51.0X3T51.0X4  
Neutral spirits
  »beverage
T51.0X1T51.0X2T51.0X3T51.0X4  
NiacinT46.7X1T46.7X2T46.7X3T46.7X4T46.7X5T46.7X6
NiacinamideT45.2X1T45.2X2T45.2X3T45.2X4T45.2X5T45.2X6
NialamideT43.1X1T43.1X2T43.1X3T43.1X4T43.1X5T43.1X6
NiaprazineT42.6X1T42.6X2T42.6X3T42.6X4T42.6X5T42.6X6
NicametateT46.7X1T46.7X2T46.7X3T46.7X4T46.7X5T46.7X6
NicardipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NicergolineT46.7X1T46.7X2T46.7X3T46.7X4T46.7X5T46.7X6
Nickel (carbonyl) (tetra-carbonyl) (fumes) (vapor)T56.891T56.892T56.893T56.894  
NickeloceneT56.891T56.892T56.893T56.894  
NiclosamideT37.4X1T37.4X2T37.4X3T37.4X4T37.4X5T37.4X6
NicofuranoseT46.7X1T46.7X2T46.7X3T46.7X4T46.7X5T46.7X6
NicomorphineT40.2X1T40.2X2T40.2X3T40.2X4  
NicorandilT46.3X1T46.3X2T46.3X3T46.3X4T46.3X5T46.3X6
Nicotiana (plant)T62.2X1T62.2X2T62.2X3T62.2X4  
NicotinamideT45.2X1T45.2X2T45.2X3T45.2X4T45.2X5T45.2X6
Nicotine (insecticide) (spray) (sulfate) NECT60.2X1T60.2X2T60.2X3T60.2X4  
Nicotine (insecticide) (spray) (sulfate) NEC
  »from tobacco
T60.2X1T60.2X2T60.2X3T60.2X4  
Nicotine (insecticide) (spray) (sulfate) NEC
  »from tobacco
    »cigarettes
T60.2X1T60.2X2T60.2X3T60.2X4  
Nicotine (insecticide) (spray) (sulfate) NEC
  »not insecticide
T60.2X1T60.2X2T60.2X3T60.2X4  
Nicotinic acidT46.7X1T46.7X2T46.7X3T46.7X4T46.7X5T46.7X6
Nicotinyl alcoholT46.7X1T46.7X2T46.7X3T46.7X4T46.7X5T46.7X6
NicoumaloneT45.511T45.512T45.513T45.514T45.515T45.516
NifedipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NifenazoneT39.2X1T39.2X2T39.2X3T39.2X4T39.2X5T39.2X6
NifuraldezoneT37.91T37.92T37.93T37.94T37.95T37.96
NifuratelT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
NifurtimoxT37.3X1T37.3X2T37.3X3T37.3X4T37.3X5T37.3X6
NifurtoinolT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
Nightshade, deadly (solanum) [See Also: Belladonna]T62.2X1T62.2X2T62.2X3T62.2X4  
Nightshade, deadly (solanum) [See Also: Belladonna]
  »berry
T62.2X1T62.2X2T62.2X3T62.2X4  
NikethamideT50.7X1T50.7X2T50.7X3T50.7X4T50.7X5T50.7X6
NilstatT36.7X1T36.7X2T36.7X3T36.7X4T36.7X5T36.7X6
Nilstat
  »topical
T36.7X1T36.7X2T36.7X3T36.7X4T36.7X5T36.7X6
NilutamideT38.6X1T38.6X2T38.6X3T38.6X4T38.6X5T38.6X6
NimesulideT39.391T39.392T39.393T39.394T39.395T39.396
NimetazepamT42.4X1T42.4X2T42.4X3T42.4X4T42.4X5T42.4X6
NimodipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NimorazoleT37.3X1T37.3X2T37.3X3T37.3X4T37.3X5T37.3X6
NimustineT45.1X1T45.1X2T45.1X3T45.1X4T45.1X5T45.1X6
NiridazoleT37.4X1T37.4X2T37.4X3T37.4X4T37.4X5T37.4X6
NisentilT40.2X1T40.2X2T40.2X3T40.2X4T40.2X5T40.2X6
NisoldipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NitramineT65.3X1T65.3X2T65.3X3T65.3X4  
Nitrate, organicT46.3X1T46.3X2T46.3X3T46.3X4T46.3X5T46.3X6
NitrazepamT42.4X1T42.4X2T42.4X3T42.4X4T42.4X5T42.4X6
NitrefazoleT50.6X1T50.6X2T50.6X3T50.6X4T50.6X5T50.6X6
NitrendipineT46.1X1T46.1X2T46.1X3T46.1X4T46.1X5T46.1X6
NitricT54.2X1T54.2X2T54.2X3T54.2X4  
Nitric
  »acid (liquid)
T54.2X1T54.2X2T54.2X3T54.2X4  
Nitric
  »acid (liquid)
    »vapor
T54.2X1T54.2X2T54.2X3T54.2X4  
Nitric
  »oxide (gas)
T54.2X1T54.2X2T54.2X3T54.2X4  
NitrimidazineT37.3X1T37.3X2T37.3X3T37.3X4T37.3X5T37.3X6
Nitrite, amyl (medicinal) (vapor)T46.3X1T46.3X2T46.3X3T46.3X4T46.3X5T46.3X6
NitroanilineT65.3X1T65.3X2T65.3X3T65.3X4  
Nitroaniline
  »vapor
T65.3X1T65.3X2T65.3X3T65.3X4  
Nitrobenzene, nitrobenzolT65.3X1T65.3X2T65.3X3T65.3X4  
Nitrobenzene, nitrobenzol
  »vapor
T65.3X1T65.3X2T65.3X3T65.3X4  
NitrocelluloseT65.891T65.892T65.893T65.894  
Nitrocellulose
  »lacquer
T65.891T65.892T65.893T65.894  
NitrodiphenylT65.3X1T65.3X2T65.3X3T65.3X4  
NitrofuralT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
NitrofurantoinT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
NitrofurazoneT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
NitrogenT59.0X1T59.0X2T59.0X3T59.0X4  
Nitrogen
  »mustard
T59.0X1T59.0X2T59.0X3T59.0X4  
Nitroglycerin, nitro-glycerol (medicinal)T46.3X1T46.3X2T46.3X3T46.3X4T46.3X5T46.3X6
Nitroglycerin, nitro-glycerol (medicinal)
  »nonmedicinal
T46.3X1T46.3X2T46.3X3T46.3X4T46.3X5T46.3X6
Nitroglycerin, nitro-glycerol (medicinal)
  »nonmedicinal
    »fumes
T46.3X1T46.3X2T46.3X3T46.3X4T46.3X5T46.3X6
NitroglycolT52.3X1T52.3X2T52.3X3T52.3X4  
Nitrohydrochloric acidT54.2X1T54.2X2T54.2X3T54.2X4  
NitromersolT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
NitronaphthaleneT65.891T65.892T65.893T65.894  
NitrophenolT54.0X1T54.0X2T54.0X3T54.0X4  
NitropropaneT52.8X1T52.8X2T52.8X3T52.8X4  
NitroprussideT46.5X1T46.5X2T46.5X3T46.5X4T46.5X5T46.5X6
NitrosodimethylamineT65.3X1T65.3X2T65.3X3T65.3X4  
NitrothiazolT37.4X1T37.4X2T37.4X3T37.4X4T37.4X5T37.4X6
Nitrotoluene, nitrotoluolT65.3X1T65.3X2T65.3X3T65.3X4  
Nitrotoluene, nitrotoluol
  »vapor
T65.3X1T65.3X2T65.3X3T65.3X4  
NitrousT54.2X1T54.2X2T54.2X3T54.2X4  
Nitrous
  »acid (liquid)
T54.2X1T54.2X2T54.2X3T54.2X4  
Nitrous
  »acid (liquid)
    »fumes
T54.2X1T54.2X2T54.2X3T54.2X4  
Nitrous
  »ether spirit
T54.2X1T54.2X2T54.2X3T54.2X4  
Nitrous
  »oxide
T54.2X1T54.2X2T54.2X3T54.2X4  
NitroxolineT37.8X1T37.8X2T37.8X3T37.8X4T37.8X5T37.8X6
NitrozoneT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
NizatidineT47.0X1T47.0X2T47.0X3T47.0X4T47.0X5T47.0X6
NizofenoneT43.8X1T43.8X2T43.8X3T43.8X4T43.8X5T43.8X6
NoctecT42.6X1T42.6X2T42.6X3T42.6X4T42.6X5T42.6X6
NoludarT42.6X1T42.6X2T42.6X3T42.6X4T42.6X5T42.6X6
NomegestrolT38.5X1T38.5X2T38.5X3T38.5X4T38.5X5T38.5X6
NomifensineT43.291T43.292T43.293T43.294T43.295T43.296
NonoxinolT49.8X1T49.8X2T49.8X3T49.8X4T49.8X5T49.8X6
Nonylphenoxy (polyethoxy-ethanol)T49.8X1T49.8X2T49.8X3T49.8X4T49.8X5T49.8X6
NoptilT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
NoradrenalineT44.4X1T44.4X2T44.4X3T44.4X4T44.4X5T44.4X6
NoramidopyrineT39.2X1T39.2X2T39.2X3T39.2X4T39.2X5T39.2X6
Noramidopyrine
  »methanesulfonate sodium
T39.2X1T39.2X2T39.2X3T39.2X4T39.2X5T39.2X6
NorbormideT60.4X1T60.4X2T60.4X3T60.4X4  
NordazepamT42.4X1T42.4X2T42.4X3T42.4X4T42.4X5T42.4X6
NorepinephrineT44.4X1T44.4X2T44.4X3T44.4X4T44.4X5T44.4X6
NorethandroloneT38.7X1T38.7X2T38.7X3T38.7X4T38.7X5T38.7X6
NorethindroneT38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
Norethisterone (acetate) (enantate)T38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
Norethisterone (acetate) (enantate)
  »with ethinylestradiol
T38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
NoretynodrelT38.5X1T38.5X2T38.5X3T38.5X4T38.5X5T38.5X6
NorfenefrineT44.4X1T44.4X2T44.4X3T44.4X4T44.4X5T44.4X6
NorfloxacinT36.8X1T36.8X2T36.8X3T36.8X4T36.8X5T36.8X6
NorgestrelT38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
NorgestrienoneT38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
NorlestrinT38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
NorlutinT38.4X1T38.4X2T38.4X3T38.4X4T38.4X5T38.4X6
Normal serum albumin (human), salt-poorT45.8X1T45.8X2T45.8X3T45.8X4T45.8X5T45.8X6
NormethandroneT38.5X1T38.5X2T38.5X3T38.5X4T38.5X5T38.5X6
NormorphineT40.2X1T40.2X2T40.2X3T40.2X4  
NorpseudoephedrineT50.5X1T50.5X2T50.5X3T50.5X4T50.5X5T50.5X6
Nortestosterone (furanpropionate)T38.7X1T38.7X2T38.7X3T38.7X4T38.7X5T38.7X6
NortriptylineT43.011T43.012T43.013T43.014T43.015T43.016
NoscapineT48.3X1T48.3X2T48.3X3T48.3X4T48.3X5T48.3X6
Nose preparationsT49.6X1T49.6X2T49.6X3T49.6X4T49.6X5T49.6X6
NovobiocinT36.5X1T36.5X2T36.5X3T36.5X4T36.5X5T36.5X6
Novocain (infiltration) (topical)T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Novocain (infiltration) (topical)
  »nerve block (peripheral) (plexus)
T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Novocain (infiltration) (topical)
  »spinal
T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Noxious foodstuffT62.91T62.92T62.93T62.94  
Noxious foodstuff
  »specified NEC
T62.91T62.92T62.93T62.94  
NoxiptilineT43.011T43.012T43.013T43.014T43.015T43.016
NoxytiolinT49.0X1T49.0X2T49.0X3T49.0X4T49.0X5T49.0X6
NPH lletin (insulin)T38.3X1T38.3X2T38.3X3T38.3X4T38.3X5T38.3X6
NumorphanT40.2X1T40.2X2T40.2X3T40.2X4T40.2X5T40.2X6
NunolT42.3X1T42.3X2T42.3X3T42.3X4T42.3X5T42.3X6
Nupercaine (spinal anesthetic)T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Nupercaine (spinal anesthetic)
  »topical (surface)
T41.3X1T41.3X2T41.3X3T41.3X4T41.3X5T41.3X6
Nutmeg oil (liniment)T49.3X1T49.3X2T49.3X3T49.3X4T49.3X5T49.3X6
Nutritional supplementT50.901T50.902T50.903T50.904T50.905T50.906
Nux vomicaT65.1X1T65.1X2T65.1X3T65.1X4  
NydrazidT37.1X1T37.1X2T37.1X3T37.1X4T37.1X5T37.1X6
NylidrinT46.7X1T46.7X2T46.7X3T46.7X4T46.7X5T46.7X6
NystatinT36.7X1T36.7X2T36.7X3T36.7X4T36.7X5T36.7X6
Nystatin
  »topical
T36.7X1T36.7X2T36.7X3T36.7X4T36.7X5T36.7X6
NytolT45.0X1T45.0X2T45.0X3T45.0X4T45.0X5T45.0X6

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.