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T53.7X1A vs T53.7X1S

T53.7X1A (Toxic effect of other halogen derivatives of aromatic hydrocarbons, accidental (unintentional), initial encounter) compared with T53.7X1S (Toxic effect of other halogen derivatives of aromatic hydrocarbons, accidental (unintentional), sequela), from the official CMS tabular data. T53.7X1A and T53.7X1S code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T53.7X1A
Initial encounter
Toxic effect of other halogen derivatives of aromatic hydrocarbons, accidental (unintentional), initial encounter
↔
T53.7X1S
Sequela
Toxic effect of other halogen derivatives of aromatic hydrocarbons, accidental (unintentional), 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. T53.7X1A and T53.7X1S 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

T53.7X1AToxic effect of other halogen derivatives of aromatic hydrocarbons, accidental (unintentional), initial encounterT53.7X1SToxic effect of other halogen derivatives of aromatic hydrocarbons, accidental (unintentional), 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 other halogen derivatives of aromatic hydrocarbons, accidental (unintentional), initial encounter is a billable ICD-10-CM diagnosis code (T53.7X1A).Toxic effect of other halogen derivatives of aromatic hydrocarbons, accidental (unintentional), sequela is a billable ICD-10-CM diagnosis code (T53.7X1S).
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 T53
Includes
Toxic effects of other halogen derivatives of aromatic hydrocarbons NOS
Toxic effects of other halogen derivatives of aromatic hydrocarbons NOS
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