ICD-10-CM Diagnosis Code T51.1X3S - Toxic effect of methanol, assault, sequela (original) (raw)

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ICD List 2025-2026 Edition

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  6. 2026 ICD-10-CM Code T51.1X3S

Toxic effect of methanol, assault, sequela

ICD-10-CM Code:

T51.1X3S

ICD-10 Code for:

Toxic effect of methanol, assault, sequela

Is Billable?

Yes - Valid for Submission

Chronic Condition Indicator: [1]

Not chronic

Code Navigator:

T51.1X3S is a billable diagnosis code used to specify a medical diagnosis of toxic effect of methanol, assault, sequela. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026. The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

T51.1X3S is a sequela code, includes a 7th character and should be used for complications that arise as a direct result of a condition like toxic effect of methanol assault. According to ICD-10-CM Guidelines a "sequela" code should be used for chronic or residual conditions that are complications of an initial acute disease, illness or injury. The most common sequela is pain. Usually, two diagnosis codes are needed when reporting sequela. The first code describes the nature of the sequela while the second code describes the sequela or late effect.

  1. Code Information
  2. Clinical Classification
  3. Coding Guidelines
  4. Tabular List of Diseases and Injuries
  5. Diagnostic Related Groups Mapping
  6. Present on Admission (POA)
  7. Convert to ICD-9 Code
  8. Table of Drugs and Chemicals
  9. Patient Education
  10. Other Codes Used Similar Conditions
  11. Code History

Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

CCSR Code: INJ075

Inpatient Default: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.

Outpatient Default: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

The appropriate 7th character is to be added to each code from block Toxic effect of alcohol (T51). Use the following options for the aplicable episode of care:

T51.1X3S is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here.

CMS POA Indicator Options and Definitions

POA Indicator: Y

Reason: Diagnosis was present at time of inpatient admission.

CMS Pays CC/MCC DRG? YES

POA Indicator: N

Reason: Diagnosis was not present at time of inpatient admission.

CMS Pays CC/MCC DRG? NO

POA Indicator: U

Reason: Documentation insufficient to determine if the condition was present at the time of inpatient admission.

CMS Pays CC/MCC DRG? NO

POA Indicator: W

Reason: Clinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.

CMS Pays CC/MCC DRG? YES

POA Indicator: 1

Reason: Unreported/Not used - Exempt from POA reporting.

CMS Pays CC/MCC DRG? NO

Below are the ICD-9 codes that most closely match this ICD-10 code, based on the General Equivalence Mappings (GEMs). This ICD-10 to ICD-9 crosswalk tool is helpful for coders who need to reference legacy diagnosis codes for audits, historical claims, or approximate code comparisons.

ICD-9-CM: 909.1

Approximate Flag - The approximate mapping means this ICD-10 code does not have an exact ICD-9 equivalent. The matched code is the closest available option, but it may not fully capture the original diagnosis or clinical intent.

The parent code T51.1X3 of the current diagnosis code is referenced in the Table of Drugs and Chemicals, this table contains a classification of drugs, industrial solvents, corrosive gases, noxious plants, pesticides, and other toxic agents.

According to ICD-10-CM coding guidelines it is advised to do not code directly from the Table of Drugs and Chemicals, instead always refer back to the Tabular List when doing the initial coding. Each substance in the table is assigned a code according to the poisoning classification and external causes of adverse effects. It is important to use as many codes as necessary to specify all reported drugs, medicinal or chemical substances. If the same diagnosis code describes the causative agent for more than one adverse reaction, poisoning, toxic effect or underdosing, utilize the code only once.

Filter table of drugs and chemicals:

Substance Poisoning Accidental (unintentional) Poisoning Accidental (self-harm) Poisoning Assault Poisoning Undetermined Adverse effect Underdosing
Canned heat T51.1X1 T51.1X2 T51.1X3 T51.1X4
Carbinol T51.1X1 T51.1X2 T51.1X3 T51.1X4
Methanol (vapor) T51.1X1 T51.1X2 T51.1X3 T51.1X4
Methylated spirit T51.1X1 T51.1X2 T51.1X3 T51.1X4
Radiator alcohol T51.1X1 T51.1X2 T51.1X3 T51.1X4
Wood alcohol or spirit T51.1X1 T51.1X2 T51.1X3 T51.1X4
Zerone T51.1X1 T51.1X2 T51.1X3 T51.1X4