Toxic effect of aflatoxin and other mycotoxin food contaminants (T64) ICD-10-CM
The T64 code range covers toxic effect of aflatoxin and other mycotoxin food contaminants with 35 ICD-10-CM diagnosis codes. 24 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
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 T64
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
Codes in the T64 Range 35 codes · 24 billable
- T64 Toxic effect of aflatoxin and other mycotoxin food contaminantsNon-billable
- T64.0 Toxic effect of aflatoxinNon-billable
- T64.01 Toxic effect of aflatoxin, accidental (unintentional)Non-billable
- T64.01XA Toxic effect of aflatoxin, accidental (unintentional), initial encounter
- T64.01XD Toxic effect of aflatoxin, accidental (unintentional), subsequent encounter
- T64.01XS Toxic effect of aflatoxin, accidental (unintentional), sequela
- T64.02 Toxic effect of aflatoxin, intentional self-harmNon-billable
- T64.02XA Toxic effect of aflatoxin, intentional self-harm, initial encounter
- T64.02XD Toxic effect of aflatoxin, intentional self-harm, subsequent encounter
- T64.02XS Toxic effect of aflatoxin, intentional self-harm, sequela
- T64.03 Toxic effect of aflatoxin, assaultNon-billable
- T64.03XA Toxic effect of aflatoxin, assault, initial encounter
- T64.03XD Toxic effect of aflatoxin, assault, subsequent encounter
- T64.03XS Toxic effect of aflatoxin, assault, sequela
- T64.04 Toxic effect of aflatoxin, undeterminedNon-billable
- T64.04XA Toxic effect of aflatoxin, undetermined, initial encounter
- T64.04XD Toxic effect of aflatoxin, undetermined, subsequent encounter
- T64.04XS Toxic effect of aflatoxin, undetermined, sequela
- T64.8 Toxic effect of other mycotoxin food contaminantsNon-billable
- T64.81 Toxic effect of other mycotoxin food contaminants, accidental (unintentional)Non-billable
- T64.81XA Toxic effect of other mycotoxin food contaminants, accidental (unintentional), initial encounter
- T64.81XD Toxic effect of other mycotoxin food contaminants, accidental (unintentional), subsequent encounter
- T64.81XS Toxic effect of other mycotoxin food contaminants, accidental (unintentional), sequela
- T64.82 Toxic effect of other mycotoxin food contaminants, intentional self-harmNon-billable
- T64.82XA Toxic effect of other mycotoxin food contaminants, intentional self-harm, initial encounter
- T64.82XD Toxic effect of other mycotoxin food contaminants, intentional self-harm, subsequent encounter
- T64.82XS Toxic effect of other mycotoxin food contaminants, intentional self-harm, sequela
- T64.83 Toxic effect of other mycotoxin food contaminants, assaultNon-billable
- T64.83XA Toxic effect of other mycotoxin food contaminants, assault, initial encounter
- T64.83XD Toxic effect of other mycotoxin food contaminants, assault, subsequent encounter
- T64.83XS Toxic effect of other mycotoxin food contaminants, assault, sequela
- T64.84 Toxic effect of other mycotoxin food contaminants, undeterminedNon-billable
- T64.84XA Toxic effect of other mycotoxin food contaminants, undetermined, initial encounter
- T64.84XD Toxic effect of other mycotoxin food contaminants, undetermined, subsequent encounter
- T64.84XS Toxic effect of other mycotoxin food contaminants, undetermined, sequela
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the T64 range.
Ergotism
Poisoning caused by ingesting ergotized grain or by the misdirected or excessive use of ergot as a medicine.
Mycotoxins
Toxic compounds produced by FUNGI.
About the T64 Code Range
The ICD-10 code section T64 covers diagnoses related to toxic effects from aflatoxin and other mycotoxin contaminants found in food. These codes distinguish between accidental, intentional, assault-related, and undetermined poisonings caused by these harmful substances.
This coding group is used to document and classify poisoning from aflatoxin specifically (e.g., T64.0 series) and from other mycotoxin contaminants (e.g., T64.8 series). For example, the ICD-10 code for toxic effect of aflatoxin, accidental (T64.01XA), includes conditions often described as accidental ingestion of aflatoxin. Similarly, the toxic effects of other mycotoxins—such as ochratoxicosis, ergotism, and Penicillium-related toxicoses—are captured under codes like T64.81XA. These codes allow classification by encounter type (initial, subsequent, or sequela) and intent (accidental, self-harm, assault, or undetermined). Utilizing this section helps accurately identify and track the cause and nature of toxic exposure to mycotoxins, which is vital for effective patient care and toxin management.
Questions About This Page
How many billable codes are in the T64 range?
Of the 35 codes in this range, 24 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the T64 range classify?
The range classifies toxic effect of aflatoxin and other mycotoxin food contaminants. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
