T24.419 Corrosion of unspecified degree of unspecified thigh

ICD-10-CM T24.419: Corrosion of unspecified degree of unspecified thigh

ICD-10-CM code T24.419 represents a corrosion injury of the thigh when both the severity and the side of the body are not specified. It falls under the chapter for injury, poisoning, and certain other consequences of external causes, specifically within the category for burns and corrosions of the lower limb. The sources establish the code tree structure and related encounter specifics. 3 4

Plain-language overview

Code T24.419 identifies a corrosion injury located on the thigh, and the code description itself notes that both the degree of the corrosion and the specific thigh affected are unspecified. 3 4

What this code represents

This diagnosis code is categorized under burns and corrosions of external body surface, specified by site, and falls within the broader chapter covering injury, poisoning, and certain other consequences of external causes. 3

The code belongs to category T24 for burn and corrosion of the lower limb, except ankle and foot, and sits within subcategory T24.4 for corrosion of unspecified degree of lower limb, except ankle and foot. 3

Coding details

The T24.419 code tree includes more specific lateral variations, listing T24.411 for corrosion of unspecified degree of right thigh and T24.412 for corrosion of unspecified degree of left thigh. 4

The T24.419 code tree distinguishes injuries by severity, listing T24.519 for first degree, T24.619 for second degree, and T24.719 for third degree corrosions of an unspecified thigh. 4

Documentation considerations

The code T24.419S is listed in the source tree to denote a sequela encounter for a corrosion of unspecified degree of unspecified thigh, indicating that encounter type is a documented element in the code tree. 4

What the sources add

While the T24.419 code tree specifies an unspecified degree and unspecified thigh, a separate Centers for Medicare and Medicaid Services source lists T24.611D for a subsequent encounter of a second degree corrosion of the right thigh. 2 4

A Centers for Medicare and Medicaid Services transmittal lists T24.719A, T24.719D, and T24.719S to denote initial, subsequent, and sequela encounters for a third degree corrosion of an unspecified thigh. 1

Sources

1. CMS Manual System - Pub 100-20 One-Time Notification — cms.gov; accessed 2026-07-25.
2. Article - Billing and Coding: Outpatient Physical and Occupational Therapy Services (A56566) — cms.gov; accessed 2026-07-25.
3. ICD-10-CM Code T24.41 | Vero — veroscribe.com; accessed 2026-07-25.
4. ICD-10-CM 2024 | T24 - Burn and corrosion of lower limb, except ankle and foot — unboundmedicine.com; accessed 2026-07-25.