2026 ICD-10-CM Diagnosis Code T47.5X4APoisoning by digestants, undetermined, initial encounter
T47.5X4A is a billable ICD-10-CM diagnosis code for poisoning by digestants, undetermined, 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, undetermined; External cause codes: poisoning by drug; and Poisoning by drugs, initial encounter.
Code Identity
Code Classification
Coding GuidelinesGuidance
When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined). If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.
The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of agents primarily affecting the gastrointestinal system (T47). 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
Betaine
a naturally occurring compound that has been of interest for its role in osmoregulation. as a drug, betaine hydrochloride has been used as a source of hydrochloric acid in the treatment of hypochlorhydria. betaine has also been used in the treatment of liver disorders, for hyperkalemia, for homocystinuria, and for gastrointestinal disturbances. (from martindale, the extra pharmacopoeia, 30th ed, p1341)Betaine-Aldehyde Dehydrogenase
an nad+ dependent enzyme that catalyzes the oxidation of betain aldehyde to betaine.Betaine-Homocysteine S-Methyltransferase
a zinc metalloenzyme that catalyzes the transfer of a methyl group from betaine to homocysteine to produce dimethylglycine and methionine, respectively. this enzyme is a member of a family of zinc-dependent methyltransferases that use thiols or selenols as methyl acceptors.Chenodeoxycholic Acid
a bile acid, usually conjugated with either glycine or taurine. it acts as a detergent to solubilize fats for intestinal absorption and is reabsorbed by the small intestine. it is used as cholagogue, a choleretic laxative, and to prevent or dissolve gallstones.Cholic Acid
a major primary bile acid produced in the liver and usually conjugated with glycine or taurine. it facilitates fat absorption and cholesterol excretion.Cholic Acids
the 3 alpha,7 alpha,12 alpha-trihydroxy-5 beta-cholanic acid family of bile acids in man, usually conjugated with glycine or taurine. they act as detergents to solubilize fats for intestinal absorption, are reabsorbed by the small intestine, and are used as cholagogues and choleretics.Citric Acid
a key intermediate in metabolism. it is an acid compound found in citrus fruits. the salts of citric acid (citrates) can be used as anticoagulants due to their calcium chelating ability.Citric Acid Cycle
a series of oxidative reactions in the breakdown of acetyl units derived from glucose; fatty acids; or amino acids by means of tricarboxylic acid intermediates. the end products are carbon dioxide, water, and energy in the form of phosphate bonds.Dehydrocholic Acid
a semisynthetic bile acid made from cholic acid. it is used as a cholagogue, hydrocholeretic, diuretic, and as a diagnostic aid.Glutamate Decarboxylase
a pyridoxal-phosphate protein that catalyzes the alpha-decarboxylation of l-glutamic acid to form gamma-aminobutyric acid and carbon dioxide. the enzyme is found in bacteria and in invertebrate and vertebrate nervous systems. it is the rate-limiting enzyme in determining gamma-aminobutyric acid levels in normal nervous tissues. the brain enzyme also acts on l-cysteate, l-cysteine sulfinate, and l-aspartate. ec 4.1.1.15.Glutamates
derivatives of glutamic acid. included under this heading are a broad variety of acid forms, salts, esters, and amides that contain the 2-aminopentanedioic acid structure.Glutamic Acid
a non-essential amino acid naturally occurring in the l-form. glutamic acid is the most common excitatory neurotransmitter in the central nervous system.Plasminogen
precursor of plasmin (fibrinolysin). it is a single-chain beta-globulin of molecular weight 80-90,000 found mostly in association with fibrinogen in plasma; plasminogen activators change it to fibrinolysin. it is used in wound debriding and has been investigated as a thrombolytic agent.RNA, Transfer, Glu
a transfer rna which is specific for carrying glutamic acid to sites on the ribosomes in preparation for protein synthesis.Pancreatin
a mammalian pancreatic extract composed of enzymes with protease, amylase and lipase activities. it is used as a digestant in pancreatic malfunction.Pancrelipase
a preparation of hog pancreatic enzymes standardized for lipase content.Coronavirus Papain-Like Proteases
papain-like proteases that occur in species of coronaviridae. some species have more than one papain-like protease gene.Papain
a proteolytic enzyme obtained from carica papaya. it is also the name used for a purified mixture of papain and chymopapain that is used as a topical enzymatic debriding agent. ec 3.4.22.2.
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.
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 T47.5X4A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T47.5X4AOverview
Is T47.5X4A (Poisoning by digestants, undetermined) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report poisoning by digestants, undetermined, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T47.5X4A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for poisoning by digestants, undetermined, such as an emergency visit or first evaluation.
What MS-DRG does T47.5X4A group to?
When poisoning by digestants, undetermined, 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 T47.5X4A?
Under the General Equivalence Mappings, poisoning by digestants, undetermined, initial encounter converts to ICD-9-CM 973.4 (poisoning-digestants) and E980.4 (undet pois-med agnt 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.
