ICD-10-CM Tabular Index · Chapter 19 · FY 2027 T51–T65
Toxic effects of substances chiefly nonmedicinal as to source (T51-T65) ICD-10-CM
The T51–T65 section covers toxic effects of substances chiefly nonmedicinal as to source with 2,474 ICD-10-CM diagnosis codes, of which 1,680 are billable in fiscal year 2027. The section is organized into the 15 code ranges listed below.
✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
15
Code Ranges
2,474
Diagnosis Codes
1,680
Billable Codes
T51–T65
Code Range
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
code(s):
for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents J60J70
personal history of foreign body fully removed Z87.821
to identify any retained foreign body, if applicable Z18
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
contact with and suspected exposure to toxic substances Z77
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.
ICD-10-CM
Code Ranges in This Section 15 ranges · 2,474 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the T51–T65 Code Range
Harmful effects of substances that are chiefly not medicines include chemicals, gases, food contaminants, and contact with venomous animals or plants.
The categories follow the substance involved. T51 separates types of alcohol, while T52 and T53 separate solvents and related chemicals. T54 covers corrosive substances, T55 soaps and detergents, and T56 and T57 metals and other inorganic substances. T58 separates carbon monoxide by its source; T59 covers other gases, fumes, and vapors.
T60 separates pesticides by type. T61 covers harmful seafood, T62 other harmful substances eaten as food, and T63 contact with venomous animals and plants. T64 covers fungal toxins in food, while T65 covers other or unspecified substances. The final character distinguishes initial encounters (A), subsequent encounters (D), and sequelae (S), or later effects.
The T51-T65 range contains 2,474 ICD-10-CM diagnosis codes in FY 2027. 1,680 of them are billable, and the rest are category headers that organize the section.
What conditions does T51-T65 cover?
The range covers toxic effects of substances chiefly nonmedicinal as to source. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
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.
The appropriate 7th character is to be added to each code from category T51
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
halogen derivatives of aliphatic and aromatic hydrocarbons T53
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.
The appropriate 7th character is to be added to each code from category T52
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
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.
The appropriate 7th character is to be added to each code from category T53
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
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.
The appropriate 7th character is to be added to each code from category T54
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
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.
The appropriate 7th character is to be added to each code from category T55
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
toxic effects of fumes and vapors of metals
toxic effects of metals from all sources, except medicinal substances
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
code to identify any retained metal foreign body, if applicable Z18.0T18.1
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
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.
The appropriate 7th character is to be added to each code from category T56
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
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.
The appropriate 7th character is to be added to each code from category T57
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
asphyxiation from carbon monoxide
toxic effect of carbon monoxide from all sources
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.
The appropriate 7th character is to be added to each code from category T58
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
aerosol propellants
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
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.
The appropriate 7th character is to be added to each code from category T59
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
toxic effect of wood preservatives
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.
The appropriate 7th character is to be added to each code from category T60
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
allergic reaction to food, such as:
anaphylactic reaction or shock due to adverse food reaction T78.0
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.
The appropriate 7th character is to be added to each code from category T61
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
allergic reaction to food, such as:
anaphylactic shock reaction due to adverse food reaction T78.0
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.
The appropriate 7th character is to be added to each code from category T62
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
bite or touch of venomous animal
pricked or stuck by thorn or leaf
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
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.
The appropriate 7th character is to be added to each code from category T63
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
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.
The appropriate 7th character is to be added to each code from category T64
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
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.
The appropriate 7th character is to be added to each code from category T65
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
