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X40-X49 ICD-10-CA block: Accidental poisoning by and exposure to noxious substances

X40-X49 isn’t a code on its own. Choose one of the 16 codes beneath it, the one the documentation supports.

Official description

X40-X49

Accidental poisoning by and exposure to noxious substances (X40-X49)

ICD-10-CA · Canada

Codes in X40-X49

X40-X49 isn’t a code on its own. Open the group that matches what the note documents.

X40Accidental poisoning by and exposure to nonopioid analgesics, antipyretics and antirheumaticsX41Accidental poisoning by and exposure to antiepileptic, sedative-hypnotic, antiparkinsonism and psychotropic drugs, not elsewhere classifiedX42Accidental poisoning by and exposure to narcotics and psychodysleptics [hallucinogens], not elsewhere classifiedX43Accidental poisoning by and exposure to other drugs acting on the autonomic nervous systemX44Accidental poisoning by and exposure to other and unspecified drugs, medicaments and biological substancesX45Accidental poisoning by and exposure to alcoholX46Accidental poisoning by and exposure to organic solvents and halogenated hydrocarbons and their vapoursX47Accidental poisoning by and exposure to carbon monoxide and other gases and vapours (7 codes)X48Accidental poisoning by and exposure to pesticidesX49Accidental poisoning by and exposure to other and unspecified chemicals and noxious substances

Notes for X40-X49

As CIHI prints them, with any note X40-X49 takes from the headings above it.

Includes

  • (self-inflicted) poisoning, when not specified whether accidental or with intent to harm.accidental overdose of drug, wrong drug given or taken in error, and drug taken inadvertentlyaccidents in the use of drugs, medicaments and biological substances in medical and surgical procedures

Use additional code

Add a code for this detail when the note documents it.

  • Use additional code from category U98.- to identify place of occurrence.

Excludes

Conditions classified elsewhere.

  • Administration with suicidal or homicidal intent, or intent to harm, or in other circumstances classifiable to (X60-X69),(X85-X90), (Y10-Y19)correct drug properly administered in therapeutic or prophylactic dosage as the cause of any adverse effect (Y40-Y59)

Note

  • For list of specific drugs and other substances classified under the three-character categories, see Table of drugs and chemicals in Alphabetical Index. Evidence of alcohol involvement in combination with substances specified below may be identified by using the supplementary codes Y90-Y91.
  • This chapter, which in previous revisions of ICD constituted a supplementary classification, permits the classification of environmental events and circumstances as the cause of injury, poisoning and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used in addition to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter XIX, Injury, poisoning and certain other consequences of external causes (S00-T98). Causes of death should preferably be tabulated according to both Chapter XIX and Chapter XX, but if only one code is tabulated then the code from Chapter XX should be used in preference. Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter XX should be used to provide additional information for multiple-condition analysis only.From Chapter 20: External causes of morbidity and mortality (V01-Y98)

Where X40-X49 sits

  1. 1ChapterChapter 20: External causes of morbidity and mortality (V01-Y98)
  2. 2Block V01-X59Accidents
  3. 3Block W00-X59Other external causes of accidental injury
  4. 4Block X40-X49Accidental poisoning by and exposure to noxious substances

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See X40-X49 in the CIHI source

Frequently asked questions

Is X40-X49 a valid ICD-10-CA code?

No. X40-X49 (Accidental poisoning by and exposure to noxious substances) is a block heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 16 codes; record the one the documentation supports.

Where is X40-X49 in ICD-10-CA?

X40-X49 sits under W00-X59 Other external causes of accidental injury, within V01-X59 Accidents, within Chapter 20: External causes of morbidity and mortality (V01-Y98).

What coding notes apply to X40-X49?

ICD-10-CA lists Note, Includes, Use additional code, Excludes notes for X40-X49, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside X40-X49

W00-W19FallsW20-W49Exposure to inanimate mechanical forcesW50-W64Exposure to animate mechanical forcesW65-W74Accidental drowning and submersionW75-W84Other accidental threats to breathingW85-W99Exposure to electric current, radiation and extreme ambient air temperature and pressureX00-X09Exposure to smoke, fire and flamesX10-X19Contact with heat and hot substancesX20-X29Contact with venomous animals and plantsX30-X39Exposure to forces of natureX50-X57Overexertion, travel and privationX58-X59Accidental exposure to other and unspecified factors