T64.04XA ICD-10 Code: Toxic effect of aflatoxin, undetermined, initial encounter

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.

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.

Toxic effect of aflatoxin, undetermined, initial encounter is a billable ICD-10-CM diagnosis code (T64.04A).

Sequencing, inclusion, and exclusion notes published for T64.04XA in the official ICD-10-CM tabular list.

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

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.-)

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

Official ICD-10-CM classifications closest to T64.04XA in its code family, with their registry titles.

T64.03 — Toxic effect of aflatoxin, assault
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, undetermined
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 contaminants
T64.81 — Toxic effect of other mycotoxin food contaminants, accidental (unintentional)
T64.81XA — Toxic effect of other mycotoxin food contaminants, accidental (unintentional), initial encounter