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T57.94XA vs T57.94XD

T57.94XA (Toxic effect of unspecified inorganic substance, undetermined, initial encounter) compared with T57.94XD (Toxic effect of unspecified inorganic substance, undetermined, subsequent encounter), from the official CMS tabular data. T57.94XA and T57.94XD code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T57.94XA
Initial encounter
Toxic effect of unspecified inorganic substance, undetermined, initial encounter
↔
T57.94XD
Subsequent encounter
Toxic effect of unspecified inorganic substance, undetermined, subsequent encounter

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. T57.94XA and T57.94XD 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

T57.94XAToxic effect of unspecified inorganic substance, undetermined, initial encounterT57.94XDToxic effect of unspecified inorganic substance, undetermined, subsequent encounter
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 unspecified inorganic substance, undetermined, initial encounter is a billable ICD-10-CM diagnosis code (T57.94A).Toxic effect of unspecified inorganic substance, undetermined, subsequent encounter is a billable ICD-10-CM diagnosis code (T57.94D).
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 T57
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