ICD-10-CM Tabular Index · Chapter 19 · FY 2027 T65

Toxic effect of other and unspecified substances (T65) ICD-10-CM

The T65 code range covers toxic effect of other and unspecified substances with 281 ICD-10-CM diagnosis codes. 192 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.

✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
281
Diagnosis Codes
192
Billable Codes
T65
Code Range
T51–T65
Parent Section

7th Character Note

Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.

7th Character

Indicates that a seventh character is to be assigned to codes in a subcategory.

ICD-10-CM

Codes in the T65 Range 281 codes · 192 billable

281 of 281 shown
  • T65 Toxic effect of other and unspecified substancesNon-billable
  • T65.0 Toxic effect of cyanidesNon-billable
  • T65.0X Toxic effect of cyanidesNon-billable
  • T65.0X1 Toxic effect of cyanides, accidental (unintentional)Non-billable
  • T65.0X1A Toxic effect of cyanides, accidental (unintentional), initial encounter
  • T65.0X1D Toxic effect of cyanides, accidental (unintentional), subsequent encounter
  • T65.0X1S Toxic effect of cyanides, accidental (unintentional), sequela
  • T65.0X2 Toxic effect of cyanides, intentional self-harmNon-billable
  • T65.0X2A Toxic effect of cyanides, intentional self-harm, initial encounter
  • T65.0X2D Toxic effect of cyanides, intentional self-harm, subsequent encounter
  • T65.0X2S Toxic effect of cyanides, intentional self-harm, sequela
  • T65.0X3 Toxic effect of cyanides, assaultNon-billable
  • T65.0X3A Toxic effect of cyanides, assault, initial encounter
  • T65.0X3D Toxic effect of cyanides, assault, subsequent encounter
  • T65.0X3S Toxic effect of cyanides, assault, sequela
  • T65.0X4 Toxic effect of cyanides, undeterminedNon-billable
  • T65.0X4A Toxic effect of cyanides, undetermined, initial encounter
  • T65.0X4D Toxic effect of cyanides, undetermined, subsequent encounter
  • T65.0X4S Toxic effect of cyanides, undetermined, sequela
  • T65.1 Toxic effect of strychnine and its saltsNon-billable
  • T65.1X Toxic effect of strychnine and its saltsNon-billable
  • T65.1X1 Toxic effect of strychnine and its salts, accidental (unintentional)Non-billable
  • T65.1X1A Toxic effect of strychnine and its salts, accidental (unintentional), initial encounter
  • T65.1X1D Toxic effect of strychnine and its salts, accidental (unintentional), subsequent encounter
  • T65.1X1S Toxic effect of strychnine and its salts, accidental (unintentional), sequela
  • T65.1X2 Toxic effect of strychnine and its salts, intentional self-harmNon-billable
  • T65.1X2A Toxic effect of strychnine and its salts, intentional self-harm, initial encounter
  • T65.1X2D Toxic effect of strychnine and its salts, intentional self-harm, subsequent encounter
  • T65.1X2S Toxic effect of strychnine and its salts, intentional self-harm, sequela
  • T65.1X3 Toxic effect of strychnine and its salts, assaultNon-billable
  • T65.1X3A Toxic effect of strychnine and its salts, assault, initial encounter
  • T65.1X3D Toxic effect of strychnine and its salts, assault, subsequent encounter
  • T65.1X3S Toxic effect of strychnine and its salts, assault, sequela
  • T65.1X4 Toxic effect of strychnine and its salts, undeterminedNon-billable
  • T65.1X4A Toxic effect of strychnine and its salts, undetermined, initial encounter
  • T65.1X4D Toxic effect of strychnine and its salts, undetermined, subsequent encounter
  • T65.1X4S Toxic effect of strychnine and its salts, undetermined, sequela
  • T65.2 Toxic effect of tobacco and nicotineNon-billable
  • T65.21 Toxic effect of chewing tobaccoNon-billable
  • T65.211 Toxic effect of chewing tobacco, accidental (unintentional)Non-billable
  • T65.211A Toxic effect of chewing tobacco, accidental (unintentional), initial encounter
  • T65.211D Toxic effect of chewing tobacco, accidental (unintentional), subsequent encounter
  • T65.211S Toxic effect of chewing tobacco, accidental (unintentional), sequela
  • T65.212 Toxic effect of chewing tobacco, intentional self-harmNon-billable
  • T65.212A Toxic effect of chewing tobacco, intentional self-harm, initial encounter
  • T65.212D Toxic effect of chewing tobacco, intentional self-harm, subsequent encounter
  • T65.212S Toxic effect of chewing tobacco, intentional self-harm, sequela
  • T65.213 Toxic effect of chewing tobacco, assaultNon-billable
  • T65.213A Toxic effect of chewing tobacco, assault, initial encounter
  • T65.213D Toxic effect of chewing tobacco, assault, subsequent encounter
  • T65.213S Toxic effect of chewing tobacco, assault, sequela
  • T65.214 Toxic effect of chewing tobacco, undeterminedNon-billable
  • T65.214A Toxic effect of chewing tobacco, undetermined, initial encounter
  • T65.214D Toxic effect of chewing tobacco, undetermined, subsequent encounter
  • T65.214S Toxic effect of chewing tobacco, undetermined, sequela
  • T65.22 Toxic effect of tobacco cigarettesNon-billable
  • T65.221 Toxic effect of tobacco cigarettes, accidental (unintentional)Non-billable
  • T65.221A Toxic effect of tobacco cigarettes, accidental (unintentional), initial encounter
  • T65.221D Toxic effect of tobacco cigarettes, accidental (unintentional), subsequent encounter
  • T65.221S Toxic effect of tobacco cigarettes, accidental (unintentional), sequela
  • T65.222 Toxic effect of tobacco cigarettes, intentional self-harmNon-billable
  • T65.222A Toxic effect of tobacco cigarettes, intentional self-harm, initial encounter
  • T65.222D Toxic effect of tobacco cigarettes, intentional self-harm, subsequent encounter
  • T65.222S Toxic effect of tobacco cigarettes, intentional self-harm, sequela
  • T65.223 Toxic effect of tobacco cigarettes, assaultNon-billable
  • T65.223A Toxic effect of tobacco cigarettes, assault, initial encounter
  • T65.223D Toxic effect of tobacco cigarettes, assault, subsequent encounter
  • T65.223S Toxic effect of tobacco cigarettes, assault, sequela
  • T65.224 Toxic effect of tobacco cigarettes, undeterminedNon-billable
  • T65.224A Toxic effect of tobacco cigarettes, undetermined, initial encounter
  • T65.224D Toxic effect of tobacco cigarettes, undetermined, subsequent encounter
  • T65.224S Toxic effect of tobacco cigarettes, undetermined, sequela
  • T65.29 Toxic effect of other tobacco and nicotineNon-billable
  • T65.291 Toxic effect of other tobacco and nicotine, accidental (unintentional)Non-billable
  • T65.291A Toxic effect of other tobacco and nicotine, accidental (unintentional), initial encounter
  • T65.291D Toxic effect of other tobacco and nicotine, accidental (unintentional), subsequent encounter
  • T65.291S Toxic effect of other tobacco and nicotine, accidental (unintentional), sequela
  • T65.292 Toxic effect of other tobacco and nicotine, intentional self-harmNon-billable
  • T65.292A Toxic effect of other tobacco and nicotine, intentional self-harm, initial encounter
  • T65.292D Toxic effect of other tobacco and nicotine, intentional self-harm, subsequent encounter
  • T65.292S Toxic effect of other tobacco and nicotine, intentional self-harm, sequela
  • T65.293 Toxic effect of other tobacco and nicotine, assaultNon-billable
  • T65.293A Toxic effect of other tobacco and nicotine, assault, initial encounter
  • T65.293D Toxic effect of other tobacco and nicotine, assault, subsequent encounter
  • T65.293S Toxic effect of other tobacco and nicotine, assault, sequela
  • T65.294 Toxic effect of other tobacco and nicotine, undeterminedNon-billable
  • T65.294A Toxic effect of other tobacco and nicotine, undetermined, initial encounter
  • T65.294D Toxic effect of other tobacco and nicotine, undetermined, subsequent encounter
  • T65.294S Toxic effect of other tobacco and nicotine, undetermined, sequela
  • T65.3 Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologuesNon-billable
  • T65.3X Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologuesNon-billable
  • T65.3X1 Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, accidental (unintentional)Non-billable
  • T65.3X1A Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, accidental (unintentional), initial encounter
  • T65.3X1D Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, accidental (unintentional), subsequent encounter
  • T65.3X1S Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, accidental (unintentional), sequela
  • T65.3X2 Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, intentional self-harmNon-billable
  • T65.3X2A Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, intentional self-harm, initial encounter
  • T65.3X2D Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, intentional self-harm, subsequent encounter
  • T65.3X2S Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, intentional self-harm, sequela
  • T65.3X3 Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, assaultNon-billable
  • T65.3X3A Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, assault, initial encounter
  • T65.3X3D Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, assault, subsequent encounter
  • T65.3X3S Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, assault, sequela
  • T65.3X4 Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, undeterminedNon-billable
  • T65.3X4A Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, undetermined, initial encounter
  • T65.3X4D Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, undetermined, subsequent encounter
  • T65.3X4S Toxic effect of nitroderivatives and aminoderivatives of benzene and its homologues, undetermined, sequela
  • T65.4 Toxic effect of carbon disulfideNon-billable
  • T65.4X Toxic effect of carbon disulfideNon-billable
  • T65.4X1 Toxic effect of carbon disulfide, accidental (unintentional)Non-billable
  • T65.4X1A Toxic effect of carbon disulfide, accidental (unintentional), initial encounter
  • T65.4X1D Toxic effect of carbon disulfide, accidental (unintentional), subsequent encounter
  • T65.4X1S Toxic effect of carbon disulfide, accidental (unintentional), sequela
  • T65.4X2 Toxic effect of carbon disulfide, intentional self-harmNon-billable
  • T65.4X2A Toxic effect of carbon disulfide, intentional self-harm, initial encounter
  • T65.4X2D Toxic effect of carbon disulfide, intentional self-harm, subsequent encounter
  • T65.4X2S Toxic effect of carbon disulfide, intentional self-harm, sequela
  • T65.4X3 Toxic effect of carbon disulfide, assaultNon-billable
  • T65.4X3A Toxic effect of carbon disulfide, assault, initial encounter
  • T65.4X3D Toxic effect of carbon disulfide, assault, subsequent encounter
  • T65.4X3S Toxic effect of carbon disulfide, assault, sequela
  • T65.4X4 Toxic effect of carbon disulfide, undeterminedNon-billable
  • T65.4X4A Toxic effect of carbon disulfide, undetermined, initial encounter
  • T65.4X4D Toxic effect of carbon disulfide, undetermined, subsequent encounter
  • T65.4X4S Toxic effect of carbon disulfide, undetermined, sequela
  • T65.5 Toxic effect of nitroglycerin and other nitric acids and estersNon-billable
  • T65.5X Toxic effect of nitroglycerin and other nitric acids and estersNon-billable
  • T65.5X1 Toxic effect of nitroglycerin and other nitric acids and esters, accidental (unintentional)Non-billable
  • T65.5X1A Toxic effect of nitroglycerin and other nitric acids and esters, accidental (unintentional), initial encounter
  • T65.5X1D Toxic effect of nitroglycerin and other nitric acids and esters, accidental (unintentional), subsequent encounter
  • T65.5X1S Toxic effect of nitroglycerin and other nitric acids and esters, accidental (unintentional), sequela
  • T65.5X2 Toxic effect of nitroglycerin and other nitric acids and esters, intentional self-harmNon-billable
  • T65.5X2A Toxic effect of nitroglycerin and other nitric acids and esters, intentional self-harm, initial encounter
  • T65.5X2D Toxic effect of nitroglycerin and other nitric acids and esters, intentional self-harm, subsequent encounter
  • T65.5X2S Toxic effect of nitroglycerin and other nitric acids and esters, intentional self-harm, sequela
  • T65.5X3 Toxic effect of nitroglycerin and other nitric acids and esters, assaultNon-billable
  • T65.5X3A Toxic effect of nitroglycerin and other nitric acids and esters, assault, initial encounter
  • T65.5X3D Toxic effect of nitroglycerin and other nitric acids and esters, assault, subsequent encounter
  • T65.5X3S Toxic effect of nitroglycerin and other nitric acids and esters, assault, sequela
  • T65.5X4 Toxic effect of nitroglycerin and other nitric acids and esters, undeterminedNon-billable
  • T65.5X4A Toxic effect of nitroglycerin and other nitric acids and esters, undetermined, initial encounter
  • T65.5X4D Toxic effect of nitroglycerin and other nitric acids and esters, undetermined, subsequent encounter
  • T65.5X4S Toxic effect of nitroglycerin and other nitric acids and esters, undetermined, sequela
  • T65.6 Toxic effect of paints and dyes, not elsewhere classifiedNon-billable
  • T65.6X Toxic effect of paints and dyes, not elsewhere classifiedNon-billable
  • T65.6X1 Toxic effect of paints and dyes, not elsewhere classified, accidental (unintentional)Non-billable
  • T65.6X1A Toxic effect of paints and dyes, not elsewhere classified, accidental (unintentional), initial encounter
  • T65.6X1D Toxic effect of paints and dyes, not elsewhere classified, accidental (unintentional), subsequent encounter
  • T65.6X1S Toxic effect of paints and dyes, not elsewhere classified, accidental (unintentional), sequela
  • T65.6X2 Toxic effect of paints and dyes, not elsewhere classified, intentional self-harmNon-billable
  • T65.6X2A Toxic effect of paints and dyes, not elsewhere classified, intentional self-harm, initial encounter
  • T65.6X2D Toxic effect of paints and dyes, not elsewhere classified, intentional self-harm, subsequent encounter
  • T65.6X2S Toxic effect of paints and dyes, not elsewhere classified, intentional self-harm, sequela
  • T65.6X3 Toxic effect of paints and dyes, not elsewhere classified, assaultNon-billable
  • T65.6X3A Toxic effect of paints and dyes, not elsewhere classified, assault, initial encounter
  • T65.6X3D Toxic effect of paints and dyes, not elsewhere classified, assault, subsequent encounter
  • T65.6X3S Toxic effect of paints and dyes, not elsewhere classified, assault, sequela
  • T65.6X4 Toxic effect of paints and dyes, not elsewhere classified, undeterminedNon-billable
  • T65.6X4A Toxic effect of paints and dyes, not elsewhere classified, undetermined, initial encounter
  • T65.6X4D Toxic effect of paints and dyes, not elsewhere classified, undetermined, subsequent encounter
  • T65.6X4S Toxic effect of paints and dyes, not elsewhere classified, undetermined, sequela
  • T65.8 Toxic effect of other specified substancesNon-billable
  • T65.81 Toxic effect of latexNon-billable
  • T65.811 Toxic effect of latex, accidental (unintentional)Non-billable
  • T65.811A Toxic effect of latex, accidental (unintentional), initial encounter
  • T65.811D Toxic effect of latex, accidental (unintentional), subsequent encounter
  • T65.811S Toxic effect of latex, accidental (unintentional), sequela
  • T65.812 Toxic effect of latex, intentional self-harmNon-billable
  • T65.812A Toxic effect of latex, intentional self-harm, initial encounter
  • T65.812D Toxic effect of latex, intentional self-harm, subsequent encounter
  • T65.812S Toxic effect of latex, intentional self-harm, sequela
  • T65.813 Toxic effect of latex, assaultNon-billable
  • T65.813A Toxic effect of latex, assault, initial encounter
  • T65.813D Toxic effect of latex, assault, subsequent encounter
  • T65.813S Toxic effect of latex, assault, sequela
  • T65.814 Toxic effect of latex, undeterminedNon-billable
  • T65.814A Toxic effect of latex, undetermined, initial encounter
  • T65.814D Toxic effect of latex, undetermined, subsequent encounter
  • T65.814S Toxic effect of latex, undetermined, sequela
  • T65.82 Toxic effect of harmful algae and algae toxinsNon-billable
  • T65.821 Toxic effect of harmful algae and algae toxins, accidental (unintentional)Non-billable
  • T65.821A Toxic effect of harmful algae and algae toxins, accidental (unintentional), initial encounter
  • T65.821D Toxic effect of harmful algae and algae toxins, accidental (unintentional), subsequent encounter
  • T65.821S Toxic effect of harmful algae and algae toxins, accidental (unintentional), sequela
  • T65.822 Toxic effect of harmful algae and algae toxins, intentional self-harmNon-billable
  • T65.822A Toxic effect of harmful algae and algae toxins, intentional self-harm, initial encounter
  • T65.822D Toxic effect of harmful algae and algae toxins, intentional self-harm, subsequent encounter
  • T65.822S Toxic effect of harmful algae and algae toxins, intentional self-harm, sequela
  • T65.823 Toxic effect of harmful algae and algae toxins, assaultNon-billable
  • T65.823A Toxic effect of harmful algae and algae toxins, assault, initial encounter
  • T65.823D Toxic effect of harmful algae and algae toxins, assault, subsequent encounter
  • T65.823S Toxic effect of harmful algae and algae toxins, assault, sequela
  • T65.824 Toxic effect of harmful algae and algae toxins, undeterminedNon-billable
  • T65.824A Toxic effect of harmful algae and algae toxins, undetermined, initial encounter
  • T65.824D Toxic effect of harmful algae and algae toxins, undetermined, subsequent encounter
  • T65.824S Toxic effect of harmful algae and algae toxins, undetermined, sequela
  • T65.83 Toxic effect of fiberglassNon-billable
  • T65.831 Toxic effect of fiberglass, accidental (unintentional)Non-billable
  • T65.831A Toxic effect of fiberglass, accidental (unintentional), initial encounter
  • T65.831D Toxic effect of fiberglass, accidental (unintentional), subsequent encounter
  • T65.831S Toxic effect of fiberglass, accidental (unintentional), sequela
  • T65.832 Toxic effect of fiberglass, intentional self-harmNon-billable
  • T65.832A Toxic effect of fiberglass, intentional self-harm, initial encounter
  • T65.832D Toxic effect of fiberglass, intentional self-harm, subsequent encounter
  • T65.832S Toxic effect of fiberglass, intentional self-harm, sequela
  • T65.833 Toxic effect of fiberglass, assaultNon-billable
  • T65.833A Toxic effect of fiberglass, assault, initial encounter
  • T65.833D Toxic effect of fiberglass, assault, subsequent encounter
  • T65.833S Toxic effect of fiberglass, assault, sequela
  • T65.834 Toxic effect of fiberglass, undeterminedNon-billable
  • T65.834A Toxic effect of fiberglass, undetermined, initial encounter
  • T65.834D Toxic effect of fiberglass, undetermined, subsequent encounter
  • T65.834S Toxic effect of fiberglass, undetermined, sequela
  • T65.84 Toxic effect of xylazineNon-billable
  • T65.841 Toxic effect of xylazine, accidental (unintentional)Non-billable
  • T65.841A Toxic effect of xylazine, accidental (unintentional), initial encounter
  • T65.841D Toxic effect of xylazine, accidental (unintentional), subsequent encounter
  • T65.841S Toxic effect of xylazine, accidental (unintentional), sequela
  • T65.842 Toxic effect of xylazine, intentional self-harmNon-billable
  • T65.842A Toxic effect of xylazine, intentional self-harm, initial encounter
  • T65.842D Toxic effect of xylazine, intentional self-harm, subsequent encounter
  • T65.842S Toxic effect of xylazine, intentional self-harm, sequela
  • T65.843 Toxic effect of xylazine, assaultNon-billable
  • T65.843A Toxic effect of xylazine, assault, initial encounter
  • T65.843D Toxic effect of xylazine, assault, subsequent encounter
  • T65.843S Toxic effect of xylazine, assault, sequela
  • T65.844 Toxic effect of xylazine, undeterminedNon-billable
  • T65.844A Toxic effect of xylazine, undetermined, initial encounter
  • T65.844D Toxic effect of xylazine, undetermined, subsequent encounter
  • T65.844S Toxic effect of xylazine, undetermined, sequela
  • T65.85 Toxic effect of medetomidineNon-billable
  • T65.851 Toxic effect of medetomidine, accidental (unintentional)Non-billable
  • T65.851A Toxic effect of medetomidine, accidental (unintentional), initial encounter New
  • T65.851D Toxic effect of medetomidine, accidental (unintentional), subsequent encounter New
  • T65.851S Toxic effect of medetomidine, accidental (unintentional), sequela New
  • T65.852 Toxic effect of medetomidine, intentional self-harmNon-billable
  • T65.852A Toxic effect of medetomidine, intentional self-harm, initial encounter New
  • T65.852D Toxic effect of medetomidine, intentional self-harm, subsequent encounter New
  • T65.852S Toxic effect of medetomidine, intentional self-harm, sequela New
  • T65.853 Toxic effect of medetomidine, assaultNon-billable
  • T65.853A Toxic effect of medetomidine, assault, initial encounter New
  • T65.853D Toxic effect of medetomidine, assault, subsequent encounter New
  • T65.853S Toxic effect of medetomidine, assault, sequela New
  • T65.854 Toxic effect of medetomidine, undeterminedNon-billable
  • T65.854A Toxic effect of medetomidine, undetermined, initial encounter New
  • T65.854D Toxic effect of medetomidine, undetermined, subsequent encounter New
  • T65.854S Toxic effect of medetomidine, undetermined, sequela New
  • T65.89 Toxic effect of other specified substancesNon-billable
  • T65.891 Toxic effect of other specified substances, accidental (unintentional)Non-billable
  • T65.891A Toxic effect of other specified substances, accidental (unintentional), initial encounter
  • T65.891D Toxic effect of other specified substances, accidental (unintentional), subsequent encounter
  • T65.891S Toxic effect of other specified substances, accidental (unintentional), sequela
  • T65.892 Toxic effect of other specified substances, intentional self-harmNon-billable
  • T65.892A Toxic effect of other specified substances, intentional self-harm, initial encounter
  • T65.892D Toxic effect of other specified substances, intentional self-harm, subsequent encounter
  • T65.892S Toxic effect of other specified substances, intentional self-harm, sequela
  • T65.893 Toxic effect of other specified substances, assaultNon-billable
  • T65.893A Toxic effect of other specified substances, assault, initial encounter
  • T65.893D Toxic effect of other specified substances, assault, subsequent encounter
  • T65.893S Toxic effect of other specified substances, assault, sequela
  • T65.894 Toxic effect of other specified substances, undeterminedNon-billable
  • T65.894A Toxic effect of other specified substances, undetermined, initial encounter
  • T65.894D Toxic effect of other specified substances, undetermined, subsequent encounter
  • T65.894S Toxic effect of other specified substances, undetermined, sequela
  • T65.9 Toxic effect of unspecified substanceNon-billable
  • T65.91 Toxic effect of unspecified substance, accidental (unintentional)Non-billable
  • T65.91XA Toxic effect of unspecified substance, accidental (unintentional), initial encounter
  • T65.91XD Toxic effect of unspecified substance, accidental (unintentional), subsequent encounter
  • T65.91XS Toxic effect of unspecified substance, accidental (unintentional), sequela
  • T65.92 Toxic effect of unspecified substance, intentional self-harmNon-billable
  • T65.92XA Toxic effect of unspecified substance, intentional self-harm, initial encounter
  • T65.92XD Toxic effect of unspecified substance, intentional self-harm, subsequent encounter
  • T65.92XS Toxic effect of unspecified substance, intentional self-harm, sequela
  • T65.93 Toxic effect of unspecified substance, assaultNon-billable
  • T65.93XA Toxic effect of unspecified substance, assault, initial encounter
  • T65.93XD Toxic effect of unspecified substance, assault, subsequent encounter
  • T65.93XS Toxic effect of unspecified substance, assault, sequela
  • T65.94 Toxic effect of unspecified substance, undeterminedNon-billable
  • T65.94XA Toxic effect of unspecified substance, undetermined, initial encounter
  • T65.94XD Toxic effect of unspecified substance, undetermined, subsequent encounter
  • T65.94XS Toxic effect of unspecified substance, undetermined, sequela

About the T65 Code Range

These toxic effects involve substances chiefly nonmedicinal in source, including cyanides, strychnine, tobacco, nicotine, paints, and dyes.

The subdivisions separate substances by name or type. T65.2 divides tobacco and nicotine effects into chewing tobacco, cigarettes, and other sources. T65.8 includes specified substances such as latex, harmful algae, and fiberglass. T65.9 identifies an unspecified substance and separates accidental exposure, self-harm, assault, and undetermined intent.

The seventh character distinguishes an initial encounter, a subsequent encounter, or a sequela, meaning a later effect.

FY 2027 changes: The FY 2027 ICD-10-CM update, effective October 1, 2026, added T65.851A, T65.851D, T65.851S, T65.852A, T65.852D, T65.852S, T65.853A, T65.853D, T65.853S, T65.854A, T65.854D and T65.854S.

Questions About This Page

How many billable codes are in the T65 range?

Of the 281 codes in this range, 192 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.

What does the T65 range classify?

The range classifies toxic effect of other and unspecified substances. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.

Related References

All ICD-10-CM ChaptersAll of Chapter 19ICD-10-CM Code LookupMS-DRG ReferenceMedicare Code EditsPOA Exempt Codes

Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.