X49 ICD-10-CA code: Accidental poisoning by and exposure to other and unspecified chemicals and noxious substances

X49 is the ICD-10-CA code for “Accidental poisoning by and exposure to other and unspecified chemicals and noxious substances” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

X49

Accidental poisoning by and exposure to other and unspecified chemicals and noxious substances

Short description: Accid poisn oth/unspec chem nox subs

ICD-10-CA · Canada

Index terms

Entries in CIHI’s alphabetical index that lead to X49. Searching the index by the condition the note names is how coders reach this code.

Minamata disease
Poisoning (accidental) (by)
Drinking poison (accidental)
Ingestion, poisonous, plant(s)
Exposure (to), noxious substance
Ingestion, poisonous, substance NEC
Liquid (noncorrosive) in eye, corrosive
Self inflicted (injury) NEC, poisoning NEC
Swallowed, swallowing, substance, caustic or corrosive
Burn, burned, burning (accidental) (by) (from) (on), vitriol
Burn, burned, burning (accidental) (by) (from) (on), acid NEC
Burn, burned, burning (accidental) (by) (from) (on), chemical (external) (internal)
Burn, burned, burning (accidental) (by) (from) (on), caustic liquid, substance (external) (internal) NEC
Burn, burned, burning (accidental) (by) (from) (on), internal, from swallowed caustic, corrosive liquid, substance

Notes for X49

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

Includes

Corrosive aromatics, acids and caustic alkalisglues and adhesivesmetals including fumes and vapourspaints and dyesplant foods and fertilizerspoisoning NOSpoisonous foodstuffs and poisonous plantssoaps and detergents
(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 proceduresFrom X40-X49 Accidental poisoning by and exposure to noxious substances

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.From X40-X49 Accidental poisoning by and exposure to noxious substances

Excludes

Conditions classified elsewhere.

Anaphylactic shock due to adverse food reaction (X58)contact with venomous animals and plants (X20-X29)
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)From X40-X49 Accidental poisoning by and exposure to noxious substances

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.From X40-X49 Accidental poisoning by and exposure to noxious substances
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 X49 sits

1ChapterChapter 20: External causes of morbidity and mortality (V01-Y98)
2Block V01-X59Accidents
3Block W00-X59Other external causes of accidental injury
4Block X40-X49Accidental poisoning by and exposure to noxious substances
5Valid code X49Accidental poisoning by and exposure to other and unspecified chemicals and 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 X49 in the CIHI source

Frequently asked questions

What does ICD-10-CA code X49 mean?

X49 is the ICD-10-CA code for “Accidental poisoning by and exposure to other and unspecified chemicals and noxious substances” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is X49 in ICD-10-CA?

X49 sits under X40-X49 Accidental poisoning by and exposure to noxious substances, within 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 X49?

ICD-10-CA lists Includes, Excludes, Note, Use additional code notes for 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.

View X40-X49