T24.309A – Burn of third degree of unspecified site of unspecified lower limb, except ankle and 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 T24.309A

Code: T24.309A (claims format: T24309A)
Description: Burn of third degree of unspecified site of unspecified lower limb, except ankle and foot, initial encounter
Short description: Burn third deg of unsp site unsp lower limb, ex ank/ft, init
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: T24 › T24.3 › T24.30 › T24.309

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.

T24 – Burn and corrosion of lower limb, except ankle and foot

Excludes2 (not included here):

burn and corrosion of ankle and foot (T25.-)
burn and corrosion of hip region (T21.-)

7th character note:

The appropriate 7th character is to be added to each code from category T24

T24.3 – Burn of third degree of lower limb, except ankle and foot

Use additional code:

external cause code to identify the source, place and intent of the burn (X00-X19, X75-X77, X96-X98, Y92)

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 T24.309

Frequently asked questions

What is ICD-10 code T24.309A?

T24.309A is the ICD-10-CM code for burn of third degree of unspecified site of unspecified lower limb, except ankle and foot, initial encounter, in the block T20-T25 (Burns and corrosions of external body surface, specified by site).

Is T24.309A a billable code?

Yes. T24.309A is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does T24.309A belong to?

It belongs to category T24 – Burn and corrosion of lower limb, except 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.