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T53.5X4A vs T53.5X4D

T53.5X4A (Toxic effect of chlorofluorocarbons, undetermined, initial encounter) compared with T53.5X4D (Toxic effect of chlorofluorocarbons, undetermined, subsequent encounter), from the official CMS tabular data. T53.5X4A and T53.5X4D code the same injury at a different phase of treatment.

Can these codes be reported together?

Same injury, other encounter phase. T53.5X4A and T53.5X4D 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

T53.5X4AToxic effect of chlorofluorocarbons, undetermined, initial encounterT53.5X4DToxic effect of chlorofluorocarbons, 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 chlorofluorocarbons, undetermined, initial encounter is a billable ICD-10-CM diagnosis code (T53.5X4A).Toxic effect of chlorofluorocarbons, undetermined, subsequent encounter is a billable ICD-10-CM diagnosis code (T53.5X4D).
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
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