2027 ICD-10-CM Diagnosis Code T51.0X1AToxic effect of ethanol, accidental (unintentional), initial encounter
T51.0X1A is a billable ICD-10-CM diagnosis code for toxic effect of ethanol, 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.
T51.0X1A no longer risk-adjusts for Medicare Advantage: it mapped to HCC 55 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the ESRD (V24) category 55 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
T51.0X1A no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Accidental poisoning by alcoholic beverage
- Accidental poisoning by denatured alcohol
- Accidental poisoning caused by alcohol
- Acute symptomatic epileptic seizure due to ethyl alcohol poisoning
- Adverse drug interaction
- Adverse medication interaction with alcohol
- Adverse reaction to alcohol
- Adverse reaction to alcoholic beverage
- Alcohol-induced epilepsy
- Alcohol-induced hypoglycemia
- Ataxia caused by alcohol
- Delayed headache caused by alcohol
- Drug interaction with alcohol
- Drug-induced epilepsy
- Macrocytosis caused by alcohol
- Non-anemic red cell disorder
- Non-diabetic hypoglycemia
- Osteonecrosis caused by alcohol
- Pain in lymph nodes after alcohol consumption
- Pain of lymph node
- Pain of lymphoreticular structure
- Poisoning caused by alcohol
- Secondary thrombocytopenia
- Substance-induced ataxia
- Thrombocytopenia caused by alcohol
- Thrombocytopenia caused by drugs
- Toxic effect of denatured alcohol
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Toxic effect of alcohol (T51). 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 T51.0X1A: its own notes plus those printed at T51.0, T51, 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 T51
- 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 T51.0X1A, its category, or a range that includes it.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Ethanol
a clear, colorless liquid rapidly absorbed from the gastrointestinal tract and distributed throughout the body. it has bactericidal activity and is used often as a topical disinfectant. it is widely used as a solvent and preservative in pharmaceutical preparations as well as serving as the primary ingredient in alcoholic beverages.
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 |
|---|---|---|---|---|---|---|
| Absinthe | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Absinthe::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::absolute | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::absolute::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::dehydrated | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::dehydrated::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::denatured | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::ethyl | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::ethyl::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::grain | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::grain::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::industrial | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::preparation for consumption | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Alcohol::surgical | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Central nervous system::depressants::ethanol | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Denatured alcohol | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Ethanol | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Ethanol::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Ethyl::alcohol | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Ethyl::alcohol::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Grain alcohol | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Industrial::alcohol | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Neutral spirits | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Neutral spirits::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Spirit (s) (neutral) NEC | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Spirit (s) (neutral) NEC::beverage | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Spirit (s) (neutral) NEC::industrial | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
| Spirit (s) (neutral) NEC::surgical | T51.0X1 | T51.0X2 | T51.0X3 | T51.0X4 | – | – |
Patient EducationClinical
Alcohol
Many Americans drink alcohol at least occasionally. The Dietary Guidelines for Americans say that adults of legal drinking age should either not drink or drink in moderation. Drinking less is better for your health than drinking more. Also, there are some people who should not drink at all.
The full article covers:
- How does alcohol affect the body?
- Why are the effects of alcohol different from person to person?
- What is moderate drinking?
- What is a standard drink?
- Who should not drink alcohol?
- What is excessive drinking?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T51.0X1A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T51.0X1AOverview
What is the ICD-10 code for toxic effect of ethanol, accidental (unintentional), initial encounter?
The ICD-10-CM code for toxic effect of ethanol, accidental (unintentional), initial encounter is T51.0X1A (sometimes written as T510X1A). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is T51.0X1A (Toxic effect of ethanol, accidental (unintentional)) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report toxic effect of ethanol, accidental (unintentional), initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character A in T51.0X1A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for toxic effect of ethanol, accidental (unintentional), such as an emergency visit or first evaluation.
What MS-DRG does T51.0X1A group to?
When toxic effect of ethanol, 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 T51.0X1A be reported with a code from Z77?
Not as a rule. The Excludes1 note at block T51-T65, which applies to T51.0X1A, 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).
Does T51.0X1A risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage. T51.0X1A mapped to HCC 55 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the ESRD (V24) category 55 (Substance Use Disorder/Moderate/Severe/Substance Use with Complications).
