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T58.2X2A vs T58.2X2S

T58.2X2A (Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, initial encounter) compared with T58.2X2S (Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, sequela), from the official CMS tabular data. T58.2X2A and T58.2X2S code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T58.2X2A
Initial encounter
Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, initial encounter
↔
T58.2X2S
Sequela
Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, sequela

Same underlying diagnosis, different encounter phase.

The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.

Source: ICD-10-CM Official Guidelines, Section I.C.19.a

Can these codes be reported together?

Same injury, other encounter phase. T58.2X2A and T58.2X2S code the same injury at a different phase of treatment, set by the 7th character.

The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.

Side by side

T58.2X2AToxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, initial encounterT58.2X2SToxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, sequela
Billing statusBillableBillable
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 carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, initial encounter is a billable ICD-10-CM diagnosis code (T58.2X2A).Toxic effect of carbon monoxide from incomplete combustion of other domestic fuels, intentional self-harm, sequela is a billable ICD-10-CM diagnosis code (T58.2X2S).
7th characterThe appropriate 7th character is to be added to each code from category T58The appropriate 7th character is to be added to each code from category T58
Includes
asphyxiation from carbon monoxide
toxic effect of carbon monoxide from all sources
asphyxiation from carbon monoxide
toxic effect of carbon monoxide from all sources
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