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T57.3 vs T62.94XS

T57.3 (Toxic effect of hydrogen cyanide) compared with T62.94XS (Toxic effect of unspecified noxious substance eaten as food, undetermined, sequela), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1. MedCoder-derived

Relationship

Conflict

Excludes1 conflict

T62.94XS
Toxic effect of unspecified noxious substance eaten as food, undetermined, sequela
↔
T57.3
Toxic effect of hydrogen cyanide

Not coded here — these two are mutually exclusive.

“toxic effect of hydrogen cyanide (T57.3-)”

An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.

Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Can these codes be reported together?

No — do not report together. T62.94XS carries an Excludes1 note covering T57.3: “toxic effect of hydrogen cyanide (T57.3-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

T57.3Toxic effect of hydrogen cyanideT62.94XSToxic effect of unspecified noxious substance eaten as food, undetermined, sequela
Billing statusNon-billable header

Report instead: T57.3X1A, T57.3X1D, T57.3X1S, T57.3X2A, T57.3X2D

Billable
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionToxic effect of hydrogen cyanide is a non-billable ICD-10-CM category code (T57.3).Toxic effect of unspecified noxious substance eaten as food, undetermined, sequela is a billable ICD-10-CM diagnosis code (T62.94XS).
7th characterThe appropriate 7th character is to be added to each code from category T57The appropriate 7th character is to be added to each code from category T62
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)
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)
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources