2026 ICD-10-CM Diagnosis Code T65.891AToxic effect of other specified substances, accidental (unintentional), initial encounter
T65.891A is a billable ICD-10-CM diagnosis code for toxic effect of other specified substances, accidental (unintentional), initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 917 through 918. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under External cause codes: intent of injury, accidental/unintentional; External cause codes: poisoning by non-drug; and Toxic effects, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Accidental exposure to plant food
- Accidental poisoning by adhesive
- Accidental poisoning by fertilizers
- Accidental poisoning by household agents
- Accidental poisoning by plant food
- Accidental poisoning by polishes
- Accidental poisoning by scouring agents
- Accidental poisoning by white washes
- Accidental poisoning caused by antiseptic and/or disinfectant
- Acne of external chemical origin
- Acute phototoxic reaction
- Adhesive causing toxic effect
- Adhesive stick causing toxic effect
- Adverse cutaneous reaction to carrier oil
- Adverse effect from PUVA photochemotherapy
- Adverse reaction to oil
- Air freshener causing toxic effect
- Allergic reaction to flour dust
- Allergic reaction to oil
- Allergic reaction to tattoo ink
- Amalgam tattoo
- Amide compound toxicity
- Antifreeze poisoning
- Aquarium agent causing toxic effect
- Aristolochic acid nephropathy
- Automotive products causing toxic effect
- Autonomic disorder caused by acrylamide
- Bathroom cleaning material causing toxic effect
- Brick cleaner causing toxic effect
- Canvas shoe whitener causing toxic effect
- Carcinogen effect
- Carcinogen effect in offspring
- Citrate poisoning
- Cut flower food causing toxic effect
- Deicer causing toxic effect
- Descaler causing toxic effect
- Diamidine poisoning
- Dipyridyl compound toxicity
- Dishwasher product causing toxic effect
- Dishwashing liquid causing toxic effect
- Drain cleaner causing toxic effect
- Dry cleaning fluid causing toxic effect
- Ericaceae poisoning
- Exogenous pigmentation of oral mucosa
- Fabric cleaner causing toxic effect
- Foreign body reaction to oily substance
- Furniture polish causing toxic effect
- Gardening product causing toxic effect
- Graffiti remover causing toxic effect
- Halogen acne
- Halogen eruption
- Ink causing toxic effect
- Kitchen cleaning material causing toxic effect
- Leaf shine causing toxic effect
- Lipoid pneumonitis
- Local exogenous pigmentation of oral mucosa
- Malignant neoplasm of skin caused by radiation
- Metal polish causing toxic effect
- Mold killer causing toxic effect
- Oven cleaner causing toxic effect
- Oxalate poisoning
- Phenanthrene poisoning
- Phenylurea compound toxicity
- Phosphate salt poisoning
- Photoallergic dermatitis
- Photoallergic dermatitis due to biocide
- Photocopier toner causing toxic effect
- Phototoxic reaction to tar or derivative
- Phototoxic reaction to topical chemical
- Pieris japonica poisoning
- Plant food causing toxic effect
- Pneumonitis caused by inhalation of oil
- Pneumonopathy due to inhalation of dust
- Poisoning by antiseptic and/or disinfectant
- Poisoning by silicone
- Poisoning by triorthocresyl phosphate
- Polychlorinated biphenyl poisoning
- Polystyrene cement causing toxic effect
- Polyurethane poisoning
- Pond agent causing toxic effect
- PUVA therapy-associated skin malignancy
- PVA adhesive causing toxic effect
- Rooting compound causing toxic effect
- Scouring product causing toxic effect
- Shoe care product causing toxic effect
- Shoe polish causing toxic effect
- Shoe waterproofer causing toxic effect
- Silicone synovitis
- Sodium benzoate-induced angioedema-urticaria
- Solid adhesive causing toxic effect
- Solid air freshener causing toxic effect
- Stain remover causing toxic effect
- Sugar soap causing toxic effect
- Toilet cleaner causing toxic effect
- Toxic effect of exhaust repair agent
- Toxic effect of soap
- Ulcer of skin caused by polycyclic aromatic hydrocarbons
- Urticaria caused by food additive
- Wallpaper adhesive causing toxic effect
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Toxic effect of other and unspecified substances (T65). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Carcinogen Effect in Offspring
alteration of any condition or process in an offspring that results form the effect of a carcinogen in a parent.
Table of Drugs and ChemicalsClinical
Substances in the Table of Drugs and Chemicals that reference this code family. Always confirm in the Tabular List before coding.
| Substance | Accidental | Self-harm | Assault | Undetermined | Adverse Effect | Underdosing |
|---|---|---|---|---|---|---|
| Acrylamide | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Acrylonitrile | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Adhesive NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Antiaris toxicaria | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Auramine | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Auramine::dye | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Auramine::fungicide | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Benzidine | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Bergamot oil | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Cleaner, cleansing agent, type not specified | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Cleaner, cleansing agent, type not specified::of paint or varnish | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Cleaner, cleansing agent, type not specified::specified type NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Cordite | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Cordite::vapor | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Diethylhexylphthalate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Disinfectant | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Disinfectant::alkaline | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Disinfectant::aromatic | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Disinfectant::intestinal | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Epoxy resin | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Fertilizers NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Fertilizers NEC::with herbicide mixture | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Furniture polish | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Glutaraldehyde (nonmedicinal) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Glutaraldehyde (nonmedicinal)::medicinal | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Grease | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Guano | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Ink | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Isophorone | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Liquor creosolis compositus | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Monosodium glutamate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Myristicin | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Naphthol | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Naphthylamine | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Nitrocellulose | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Nitrocellulose::lacquer | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Nitronaphthalene | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of)::bitter almond | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of)::cloves | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of)::colors | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of)::fumes | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of)::lubricating | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of)::Niobe | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of)::vitriol (liquid) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of)::vitriol (liquid)::fumes | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Oil (of)::wintergreen (bitter) NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| PBB (polybrominated biphenyls) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| PCB | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Permanganate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Phosphate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Phosphate::laxative | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Phosphate::organic | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Phosphate::solvent | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Phosphate::tricresyl | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Phthalates | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Phthalic anhydride | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Pine oil (disinfectant) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Pitch | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Plant | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Plant::food or fertilizer NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Plant::food or fertilizer NEC::containing herbicide | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Plant::noxious, used as food | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Plant::noxious, used as food::berries | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Plant::noxious, used as food::seeds | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Plant::noxious, used as food::specified type NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Polish (car) (floor) (furniture) (metal) (porcelain) (silver) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Polish (car) (floor) (furniture) (metal) (porcelain) (silver)::abrasive | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Polish (car) (floor) (furniture) (metal) (porcelain) (silver)::porcelain | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Polychlorinated biphenyl | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Preservative (nonmedicinal) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Preservative (nonmedicinal)::medicinal | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Preservative (nonmedicinal)::wood | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Prussian blue | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Prussian blue::commercial | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Prussian blue::therapeutic | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Psoralene (nonmedicinal) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Reducing agent, industrial NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Resorcin, resorcinol (nonmedicinal) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Resorcin, resorcinol (nonmedicinal)::medicinal | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Scouring powder | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Silicone NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Silicone NEC::medicinal | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Soldering fluid | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Styrene | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Tartaric acid | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Thioglycolic acid | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Toilet deodorizer | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Toluidine | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Toluidine::vapor | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Tricresyl phosphate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Tricresyl phosphate::solvent | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Triorthocresyl phosphate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Triphenylphosphate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Vinyl | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Vinyl::acetate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Vinyl::bital | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Vinyl::bromide | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Vinyl::chloride | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Vinyl::ether | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Vinylidene chloride | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Whitewash | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Window cleaning fluid | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
Patient EducationClinical
Poisoning
A poison is any substance that is harmful to your body. You might swallow it, inhale it, inject it, or absorb it through your skin. Any substance can be poisonous if too much is taken. Poisons can include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T65.891A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replaced This code was replaced in the FY 2026 code set by:
- T65.841A - Toxic effect of xylazine, accidental (unintentional), init
- T65.841A - Toxic effect of xylazine, accidental (unintentional), init
Questions About T65.891AOverview
Is T65.891A a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of other specified substances, accidental (unintentional), initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T65.891A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for toxic effect of other specified substances, accidental (unintentional), such as an emergency visit or first evaluation.
What MS-DRG does T65.891A group to?
When toxic effect of other specified substances, accidental (unintentional), initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 917, 918, with relative weights from 0.8571 to 1.5684 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of T65.891A?
Under the General Equivalence Mappings, toxic effect of other specified substances, accidental (unintentional), initial encounter converts to ICD-9-CM 989.89 (tox eff nonmed subst NEC) and E866.8 (acc pois-solid/liq NEC). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
