2027 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 2027 (October 1, 2026 through September 30, 2027) 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 lipoid pneumonia due to aspiration into lower respiratory tract
- Exogenous lipoid pneumonitis
- 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
- Poisoning caused by industrial filler
- 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 2027, published by CMS and the National Center for Health Statistics.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to T65.891A: its own notes plus those printed at T65, block T51-T65, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- contact with and (suspected) exposure to toxic substances (Z77.-)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify any retained foreign body, if applicable (Z18.-)
Notes
General instructions on how these codes are used.
- When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
7th Character
Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.
- The appropriate 7th character is to be added to each code from category T65
- Ainitial encounter this code
- Dsubsequent encounter
- Ssequela
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 |
|---|---|---|---|---|---|---|
| Acetaldehyde (vapor)::liquid | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Acetic::anhydride | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| 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 | – | – |
| Amyl::propionate | 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 | – | – |
| 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::specified type NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Cordite | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Diethylhexylphthalate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Dimethyl::sulfate (fumes)::liquid | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Disinfectant | 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 | – | – |
| Furniture polish | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Glutaral (medicinal)::nonmedicinal | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Glutaraldehyde (nonmedicinal) | 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 | – | – |
| Jamaica::ginger | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Liquid::specified NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Liquor creosolis compositus | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Methyl::acrylate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Methyl::hydrazine | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Methyl::iodide | 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 | – | – |
| 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::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::food or fertilizer 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 | – | – |
| Potassium (salts) NEC::chlorate NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Potassium (salts) NEC::ferric hexacyanoferrate (medicinal)::nonmedicinal | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Potassium (salts) NEC::oxalate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Potassium (salts) NEC::perchlorate (nonmedicinal) NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Potassium (salts) NEC::Permanganate (nonmedicinal) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Preservative (nonmedicinal) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Prussian blue::commercial | 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 | – | – |
| Scouring powder | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Silicone NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Sodium::bisulfate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Sodium::chlorate NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Sodium::chromate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Sodium::metasilicate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Sodium::nitrate (oxidizing agent) | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Sodium::oxalate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Sodium::oxide/peroxide | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Sodium::perborate (nonmedicinal) NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Soldering fluid | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Solid substance::specified NEC | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Spray (aerosol)::cosmetic | 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 | – | – |
| Tricresyl phosphate | 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::acetate | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Vinyl::bromide | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Vinylidene chloride | T65.891 | T65.892 | T65.893 | T65.894 | – | – |
| Wax (paraffin) (petroleum)::automobile | 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 2027 code set by:
- T65.851A - Toxic effect of medetomidine, accidental, 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, 2026 through September 30, 2027.
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 918, 917, with relative weights from 0.8716 to 1.5698 depending on complications. Higher weights mean higher Medicare reimbursement.
Can T65.891A be reported with a code from Z77?
Not as a rule. The Excludes1 note at block T51-T65, which applies to T65.891A, lists "contact with and (suspected) exposure to toxic substances (Z77.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
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.
