Skip to main content

T53.5 vs T59.94XS

T53.5 (Toxic effects of chlorofluorocarbons) compared with T59.94XS (Toxic effect of unspecified gases, fumes and vapors, 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

T59.94XS
Toxic effect of unspecified gases, fumes and vapors, undetermined, sequela
↔
T53.5
Toxic effects of chlorofluorocarbons

Not coded here — these two are mutually exclusive.

“chlorofluorocarbons (T53.5)”

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. T59.94XS carries an Excludes1 note covering T53.5: “chlorofluorocarbons (T53.5)”

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

T53.5Toxic effects of chlorofluorocarbonsT59.94XSToxic effect of unspecified gases, fumes and vapors, undetermined, sequela
Billing statusNon-billable header

Report instead: T53.5X1A, T53.5X1D, T53.5X1S, T53.5X2A, T53.5X2D

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 effects of chlorofluorocarbons is a non-billable ICD-10-CM category code (T53.5).Toxic effect of unspecified gases, fumes and vapors, undetermined, sequela is a billable ICD-10-CM diagnosis code (T59.94S).
7th characterThe appropriate 7th character is to be added to each code from category T53The appropriate 7th character is to be added to each code from category T59
Includes—
aerosol propellants
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)
Edit this comparisonCheck a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources