T25.721A – Corrosion of third degree of right foot, initial encounter

ICD-10-CM 2027 diagnosis code · Burns and corrosions of external body surface, specified by site

Billable code

ICD-10-CM code T25.721A

Code: T25.721A (claims format: T25721A)
Description: Corrosion of third degree of right foot, initial encounter
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: T20-T25 Burns and corrosions of external body surface, specified by site
Parent codes: T25 › T25.7 › T25.72 › T25.721

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

T25 – Burn and corrosion of ankle and foot

7th character note:

The appropriate 7th character is to be added to each code from category T25

T25.7 – Corrosion of third degree of ankle and foot

Code first:

(T51-T65) to identify chemical and intent

Use additional code:

external cause code to identify place (Y92)

T25.72 – Corrosion of third degree of foot

Excludes2 (not included here):

corrosion of third degree of toe(s) (nail) (T25.73-)

Block T20-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]

Use additional code:

code from category T31 or T32 to identify extent of body surface involved

Related codes in T25.721

Frequently asked questions

What is ICD-10 code T25.721A?

T25.721A is the ICD-10-CM code for corrosion of third degree of right foot, initial encounter, in the block T20-T25 (Burns and corrosions of external body surface, specified by site).

Is T25.721A a billable code?

Yes. T25.721A is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does T25.721A belong to?

It belongs to category T25 – Burn and corrosion of ankle and foot.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.