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T25.491D vs T25.492D

T25.491D (Corrosion of unspecified degree of multiple sites of right ankle and foot, subsequent encounter) compared with T25.492D (Corrosion of unspecified degree of multiple sites of left ankle and foot, subsequent encounter), from the official CMS tabular data. T25.491D and T25.492D code the same condition on opposite sides.

Relationship

Review

Laterality relationship

T25.491D
Right
Corrosion of unspecified degree of multiple sites of right ankle and foot, subsequent encounter
↔
T25.492D
Left
Corrosion of unspecified degree of multiple sites of left ankle and foot, subsequent encounter

Same condition; these differ only in which side is documented.

These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.

Source: ICD-10-CM tabular list (laterality variant derived from the code title)

Can these codes be reported together?

Same condition, opposite side. T25.491D and T25.492D name the same condition on opposite sides of the body.

Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

Side by side

T25.491DCorrosion of unspecified degree of multiple sites of right ankle and foot, subsequent encounterT25.492DCorrosion of unspecified degree of multiple sites of left ankle and foot, 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)
DefinitionCorrosion of unspecified degree of multiple sites of right ankle and foot, subsequent encounter is a billable ICD-10-CM diagnosis code (T25.491D).Corrosion of unspecified degree of multiple sites of left ankle and foot, subsequent encounter is a billable ICD-10-CM diagnosis code (T25.492D).
7th characterThe appropriate 7th character is to be added to each code from category T25The appropriate 7th character is to be added to each code from category T25
Includes
burns and corrosions of first degree [erythema]
burns and corrosions of second degree [blisters][epidermal loss]
burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]
burns and corrosions of first degree [erythema]
burns and corrosions of second degree [blisters][epidermal loss]
burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]
Use additional code
external cause code to identify place (Y92)
code from category T31 or T32 to identify extent of body surface involved
external cause code to identify place (Y92)
code from category T31 or T32 to identify extent of body surface involved
Code first
(T51-T65) to identify chemical and intent
(T51-T65) to identify chemical and intent
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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