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ICD-10/T64.03XA

T64.03XA ICD-10-CM Code: Toxic effect of aflatoxin, assault, initial encounter

T64.03XA is the authoritative medical code for Toxic effect of aflatoxin, assault, initial encounter. This classification is used in medical billing and clinical recording to specify the clinical criteria for toxic effect of aflatoxin, assault, initial encounter (ICD-10-CM T64.03XA), ensuring healthcare documentation aligns with current federal coding standards.

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 917 — POISONING AND TOXIC EFFECTS OF DRUGS WITH MCC (MDC 21)
  • MS-DRG 918 — POISONING AND TOXIC EFFECTS OF DRUGS WITHOUT MCC (MDC 21)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Toxic effect of aflatoxin, assault, initial encounter is a billable ICD-10-CM diagnosis code (T64.03A). Excludes1 (not coded here): contact with and (suspected) exposure to toxic substances (Z77.-). Use additional code: code(s):; for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70); personal history of foreign body fully removed (Z87.821); to identify any retained foreign body, if applicable (Z18.-). 7th character: The appropriate 7th character is to be added to each code from category T64.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T64.03XA in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • contact with and (suspected) exposure to toxic substances (Z77.-)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code(s):
  • for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
  • personal history of foreign body fully removed (Z87.821)
  • to identify any retained foreign body, if applicable (Z18.-)

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T64.03XA require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T64.

What can't be coded together with T64.03XA?

Per official ICD-10-CM Excludes1 instructions, T64.03XA must not be reported together with: contact with and (suspected) exposure to toxic substances (Z77.-).

Is an additional code needed with T64.03XA?

Use additional code(s) to specify: code(s):; for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70); personal history of foreign body fully removed (Z87.821); to identify any retained foreign body, if applicable (Z18.-).

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T64.03XA in its code family, with their registry titles.

  • T64.02 — Toxic effect of aflatoxin, intentional self-harm
  • 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, assault
  • T64.03XD — Toxic effect of aflatoxin, assault, subsequent encounter
  • T64.03XS — Toxic effect of aflatoxin, assault, sequela
  • T64.04 — Toxic effect of aflatoxin, undetermined
  • T64.04XA — Toxic effect of aflatoxin, undetermined, initial encounter
  • T64.04XD — Toxic effect of aflatoxin, undetermined, subsequent encounter

View all codes in the T64 family