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T59.3X3A vs T59.3X3D

T59.3X3A (Toxic effect of lacrimogenic gas, assault, initial encounter) compared with T59.3X3D (Toxic effect of lacrimogenic gas, assault, subsequent encounter), from the official CMS tabular data. T59.3X3A and T59.3X3D code the same injury at a different phase of treatment.

Can these codes be reported together?

Same injury, other encounter phase. T59.3X3A and T59.3X3D 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

T59.3X3AToxic effect of lacrimogenic gas, assault, initial encounterT59.3X3DToxic effect of lacrimogenic gas, assault, 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 lacrimogenic gas, assault, initial encounter is a billable ICD-10-CM diagnosis code (T59.3X3A).Toxic effect of lacrimogenic gas, assault, subsequent encounter is a billable ICD-10-CM diagnosis code (T59.3X3D).
7th characterThe appropriate 7th character is to be added to each code from category T59The appropriate 7th character is to be added to each code from category T59
Includes
aerosol propellants
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)
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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