2027 ICD-10-CM Diagnosis Code T63.791AToxic effect of contact with other venomous plant, accidental (unintentional), initial encounter
T63.791A is a billable ICD-10-CM diagnosis code for toxic effect of contact with other venomous plant, 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: natural/environment; initial encounter; and Toxic effects, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abrus precatorius poisoning
- Acacia berlandieri poisoning
- Acacia georginae poisoning
- Acacia nilotica poisoning
- Acacia poisoning
- Acer rubrum poisoning
- Acokanthera poisoning
- Aconitum poisoning
- Adenia poisoning
- Adenium multiflorum poisoning
- Adenium poisoning
- Aesculus hippocastanum poisoning
- Aesculus poisoning
- Agave lecheguilla poisoning
- Agave poisoning
- Agrostemma githago poisoning
- Agrostemma poisoning
- Aizoaceae poisoning
- Albizia poisoning
- Aleurites fordii poisoning
- Allergic reaction to plant, except food
- Allium cepa poisoning
- Allium poisoning
- Amaranthaceae poisoning
- Amianthium muscaetoxicum poisoning
- Ammi majus poisoning
- Ammi poisoning
- Amsinckia intermedia poisoning
- Amsinckia poisoning
- Anacardiaceae poisoning
- Anthoxanthum odoratum poisoning
- Apiaceae poisoning
- Apocynum poisoning
- Araceae poisoning
- Araliaceae poisoning
- Argemone poisoning
- Arisaema poisoning
- Arisaema triphyllum poisoning
- Arum maculatum poisoning
- Asaemia axillaris poisoning
- Asclepias fructicosa poisoning
- Asclepias poisoning
- Asteraceae poisoning
- Astragalus poisoning
- Athanasia trifurcata poisoning
- Atropa belladonna poisoning
- Avena sativa poisoning
- Baccharis poisoning
- Baileya multiradiata poisoning
- Berberidaceae poisoning
- Beta poisoning
- Beta vulgaris poisoning
- Boraginaceae poisoning
- Bowiea poisoning
- Brachiaria poisoning
- Bulnesia sarmientii poisoning
- Burr trefoil poisoning
- Caryophyllaceae poisoning
- Cassia poisoning
- Castalis poisoning
- Centaurea poisoning
- Centaurea solstitialis poisoning
- Cestrum diurnum poisoning
- Cestrum laevigatum poisoning
- Cestrum parqui poisoning
- Cestrum poisoning
- Cheilanthes sieberi poisoning
- Cheilanthes sinnata poisoning
- Chelidonium majus poisoning
- Chenopodiaceae poisoning
- Chenopodium album poisoning
- Chinkerinchee poisoning
- Chrysocoma tenuifolia poisoning
- Cicuta maculata poisoning
- Cicuta poisoning
- Cicuta virosa poisoning
- Cinchonism
- Clusiaceae poisoning
- Colchicum autumnale poisoning
- Colocasia antiquorum poisoning
- Common pigweed poisoning
- Conium maculatum poisoning
- Convallaria majalis poisoning
- Convolvulaceae poisoning
- Crotalaria burkeana poisoning
- Crotalaria dura poisoning
- Crotalaria globifera poisoning
- Crotalaria juncea poisoning
- Crotalaria poisoning
- Crotalaria spartioides poisoning
- Crotalaria spectabilis poisoning
- Croton poisoning
- Cryptostegia grandiflora poisoning
- Cucumis poisoning
- Cucurbitaceae poisoning
- Cycadaceae poisoning
- Cycas poisoning
- Cymopterus watsonii poisoning
- Cynanchum poisoning
- Cynodon dactylon poisoning
- Cynodon poisoning
- Cynoglossum officinale poisoning
- Datura poisoning
- Datura stramonium poisoning
- Delphinium poisoning
- Dicentra canadensis poisoning
- Dicentra cucullaria poisoning
- Dicentra poisoning
- Dicentra spectabilis poisoning
- Dichapetalaceae poisoning
- Dichapetalum cymosum poisoning
- Dichapetalum poisoning
- Dieffenbachia poisoning
- Dipcadi glaucum poisoning
- Drymaria pachyphylla poisoning
- Dryopteris poisoning
- Echinopogon ovatus poisoning
- Echium lycopis poisoning
- Echium poisoning
- Encephalartos poisoning
- Ericaceae poisoning
- Erythrophleum chlorostachys poisoning
- Erythrophleum poisoning
- Eucalyptus cladocalyx poisoning
- Eucalyptus poisoning
- Eupatorium adenophorum poisoning
- Eupatorium rugosum poisoning
- Euphorbia mauritanica poisoning
- Euphorbia poisoning
- Euphorbiaceae poisoning
- Fabaceae poisoning
- Fadogia homblei poisoning
- Fagaceae poisoning
- Fagopyrum esculentum poisoning
- Fagopyrum poisoning
- Fagus sylvatica poisoning
- Galega poisoning
- Galenia africana poisoning
- Gastrolobium poisoning
- Geigeria poisoning
- Gelsemium sempervirens poisoning
- Glycine max poisoning
- Gossypol poisoning
- Gutierrezia microcephala poisoning
- Gutierrezia poisoning
- Halogeton glomeratus poisoning
- Halogeton poisoning
- Haplopappus heterophyllus poisoning
- Helenium hoopesii poisoning
- Helenium microcephalum poisoning
- Helenium poisoning
- Helichrysum poisoning
- Heliotropium europaeum poisoning
- Hertia pallens poisoning
- Hordeum vulgare poisoning
- Hymenoxys odorata poisoning
- Hymenoxys poisoning
- Hymenoxys richardsonii poisoning
- Hyoscyamus niger poisoning
- Hypericum perforatum poisoning
- Hypericum poisoning
- Indigofera dominii poisoning
- Inula conyza poisoning
- Inula graveolens poisoning
- Ipomoea batatas poisoning
- Ipomoea muelleri poisoning
- Ipomoea poisoning
- Isotropis poisoning
- Jatropha curcas poisoning
- Juncaginaceae poisoning
- Kallstroemia hirsutissima poisoning
- Kalmia angustifolia poisoning
- Kalmia poisoning
- Karwinskia humboldtiana poisoning
- Kochia scoparia poisoning
- Laburnum anagyroides poisoning
- Lantana camara poisoning
- Lantana poisoning
- Lasiospermum bipinnatum poisoning
- Leucaena poisoning
- Lidneria poisoning
- Liliaceae poisoning
- Lippia poisoning
- Loganiaceae poisoning
- Lolium perenne poisoning
- Lolium poisoning
- Lolium rigidum poisoning
- Lolium temulentum poisoning
- Lupinus digitatus poisoning
- Lupinus poisoning
- Lupinus sericeus poisoning
- Macrozamia poisoning
- Manihot poisoning
- Marsilea drummondii poisoning
- Matricaria nigellifolia poisoning
- Medicago poisoning
- Medicago sativa poisoning
- Melianthaceae poisoning
- Melianthus poisoning
- Melica decumbens poisoning
- Melica poisoning
- Melilotus alba poisoning
- Melilotus poisoning
- Mercurialis annua poisoning
- Mercurialis poisoning
- Mesembryanthemum poisoning
- Mimosa pudica poisoning
- Moldy walnut poisoning
- Mountain laurel poisoning
- Myrtaceae poisoning
- Narthecium ossifragum poisoning
- Nerium oleander poisoning
- Nicotiana glauca poisoning
- Nicotiana poisoning
- Nidorella poisoning
- Nolina texana poisoning
- Oenanthe poisoning
- Onoclea sensibilis poisoning
- Ornithogalum poisoning
- Ornithoglossum viride poisoning
- Osteospermum ecklonis poisoning
- Osteospermum poisoning
- Oxalidaceae poisoning
- Oxalis poisoning
- Oxylobium poisoning
- Oxytenia acerosa poisoning
- Oxytropis poisoning
- Pachystigma poisoning
- Panicum coloratum poisoning
- Panicum effusum poisoning
- Panicum poisoning
- Papaver poisoning
- Papaveraceae poisoning
- Paspalum commersonii poisoning
- Paspalum dilatatum poisoning
- Paspalum poisoning
- Pavetta poisoning
- Peganum harmala poisoning
- Pennisetum clandestinum poisoning
- Phalaris aquatica poisoning
- Phalaris minor poisoning
- Phalaris poisoning
- Phaseolus poisoning
- Philodendron poisoning
- Phyllanthus abnormis poisoning
- Phytolacca americana poisoning
- Phytolacca poisoning
- Phytolaccaceae poisoning
- Pigweed poisoning
- Pinaceae poisoning
- Pinus poisoning
- Pinus ponderosa poisoning
- Pithecellobium jiringa poisoning
- Plant thorn synovitis
- Poaceae poisoning
- Poisoning by lower plant
- Poisoning caused by Apocynaceae
- Poisoning caused by Passifloraceae
- Polygonaceae poisoning
- Polygonum poisoning
- Polypodiaceae poisoning
- Portulaca oleracea poisoning
- Portulaca poisoning
- Portulacaceae poisoning
- Prosopis glandulosa poisoning
- Prunus caroliniana poisoning
- Prunus poisoning
- Prunus serotina poisoning
- Prunus virginiana poisoning
- Psilocaulon poisoning
- Psilostrophe poisoning
- Pteronia pallens poisoning
- Quercus havardi poisoning
- Quercus poisoning
- Ranunculaceae poisoning
- Ranunculus poisoning
- Rhamnaceae poisoning
- Rheum rhaponicum poisoning
- Rhododendron indicum poisoning
- Rhododendron poisoning
- Robinia pseudoacacia poisoning
- Robinia viscosa poisoning
- Rosaceae poisoning
- Rubiaceae poisoning
- Rumex poisoning
- Rutaceae poisoning
- Salsola poisoning
- Salsola tuberculatiformis poisoning
- Santalaceae poisoning
- Sapindaceae poisoning
- Sapium sebiferum poisoning
- Saponaria officinalis poisoning
- Saponaria poisoning
- Secale cereale poisoning
- Senecio poisoning
- Sesbania poisoning
- Sesbania punicea poisoning
- Sesbania vesicaria poisoning
- Setaria lutescens poisoning
- Setaria poisoning
- Soft khaki weed poisoning
- Solanaceae poisoning
- Solanum incanum poisoning
- Solanum kwebense poisoning
- Solanum malacoxylon poisoning
- Solanum nigrum poisoning
- Solanum poisoning
- Solanum tuberosum poisoning
- Sophora secundiflora poisoning
- Sorghum almum poisoning
- Sorghum bicolor poisoning
- Sorghum halepense poisoning
- Sorghum poisoning
- Sorghum vulgare poisoning
- Sphenosciadium capitellatum poisoning
- Stinking willie poisoning
- Stipa poisoning
- Strophanthus poisoning
- Stypandra poisoning
- Swainsona poisoning
- Tetradymia glabrata poisoning
- Thamnosma texana poisoning
- Thesium poisoning
- Thevetia peruviana poisoning
- Threlkeldia proceriflora poisoning
- Toxic effect of plant
- Toxicodendron diversilobum poisoning
- Toxicodendron radicans poisoning
- Toxicodendron vernix poisoning
- Trachyandra poisoning
- Trachymene poisoning
- Trema aspera poisoning
- Trianthema poisoning
- Tribulus terrestris poisoning
- Trifolium hybridum poisoning
- Trifolium poisoning
- Trifolium pratense poisoning
- Trifolium repens poisoning
- Trifolium subterraneum poisoning
- Triglochin poisoning
- Trisetum flavescens poisoning
- Ulmaceae poisoning
- Urginea maritima poisoning
- Urginea poisoning
- Veratrum californicum poisoning
- Veratrum poisoning
- Verbenaceae poisoning
- Vicia faba poisoning
- Vicia poisoning
- Vicia villosa poisoning
- Vinca poisoning
- Wedelia asperrima poisoning
- Wild everlasting poisoning
- Xanthium poisoning
- Xanthorrhoea poisoning
- Xanthorrhoeaceae poisoning
- Zamia poisoning
- Zamiaceae poisoning
- Zieria arborescens poisoning
- Zygadenus poisoning
- Zygophyllaceae poisoning
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Toxic effect of contact with venomous animals and plants (T63). 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 T63.791A: its own notes plus those printed at T63, block T51-T65, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- bite or touch of venomous animal
- pricked or stuck by thorn or leaf
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 T63
- Ainitial encounter this code
- Dsubsequent encounter
- Ssequela
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name T63.791A, its category, or a range that includes it.
Excludes1 4
These codes carry an Excludes1 note naming T63.791A: they are not reported together with it, unless the two conditions are unrelated.
- Block W50-W64 Exposure to animate mechanical forcesToxic effect of contact with venomous animals and plants (T63.-) names T63.-, which includes this code
- W56 Contact with nonvenomous marine animalcontact with venomous marine animal (T63.-) names T63.-, which includes this code
- W60 Contact with nonvenomous plant thorns and spines and sharp leavesContact with venomous plants (T63.7-) names T63.7-, which includes this code
- W64 Exposure to other animate mechanical forcescontact with venomous animal (T63.-) names T63.-, which includes this code
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of Drugs and ChemicalsClinical
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 T63.791A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T63.791AOverview
Is T63.791A a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of contact with other venomous plant, accidental (unintentional), initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character A in T63.791A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for toxic effect of contact with other venomous plant, accidental (unintentional), such as an emergency visit or first evaluation.
What MS-DRG does T63.791A group to?
When toxic effect of contact with other venomous plant, 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 T63.791A be reported with a code from Z77?
Not as a rule. The Excludes1 note at block T51-T65, which applies to T63.791A, 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 T63.791A?
Under the General Equivalence Mappings, toxic effect of contact with other venomous plant, accidental (unintentional), initial encounter converts to ICD-9-CM 989.5 (toxic effect venom) and E905.6 (venom sea animals/plants). The mapping is approximate, so confirm the match fits the documentation.
