T31.42 Burns involving 40-49% of body surface with 20-29% third degree burns

ICD-10-CM T31.42: Burns involving 40-49% of body surface with 20-29% third degree burns

ICD-10-CM code T31.42 classifies burns involving 40-49% of the body surface with 20-29% third degree burns. The concept is active and categorized under the parent code T31.4. It is assigned the semantic type of Injury or Poisoning and appears in official Medicare billing articles. 1 3 5

Plain-language overview

Code T31.42 identifies an injury where 40 to 49 percent of a person's total body surface is burned, and 20 to 29 percent of that area consists of third-degree burns. 1

What this code represents

The terminology record classifies this diagnosis concept with the semantic type of Injury or Poisoning, maintaining an active record status within the ICD-10-CM version 2026. 1

This specific diagnosis code is a narrower concept under the parent code T31.4, which broadly covers burns involving 40 to 49 percent of the body surface. 1

Coding details

The official published abbreviation for this diagnosis is burns of 40 to 49 percent of body surface with 20 to 29 percent third-degree burns, according to the terminology record. 1

A Medicare billing article lists T31.42 immediately following T31.41, which represents burns involving 40 to 49 percent of the body surface with 10 to 19 percent third-degree burns. 3

Documentation considerations

The official preferred name for T31.42 specifies both the total body surface percentage and the third-degree burn percentage, establishing the exact parameters documented for this code. 1

Coverage and utilization context

The diagnosis code T31.42 appears in official Medicare billing and coding articles titled for tetanus immunization and oximetry services, listing it alongside related burn diagnoses. 3 4

What the sources add

The National Cancer Institute terminology record defines the code's hierarchical structure and semantic type, while the Medicare articles list the code alongside related burn diagnoses. 1 3

The EVS Explore portal confirms the preferred name and Injury or Poisoning semantic type for T31.42, providing an additional official terminology source for this specific code. 5

Sources

1. ICD-10-CM T31.42 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Tetanus Immunization (A52438) — cms.gov; accessed 2026-07-27.
4. Article - Billing and Coding: Oximetry Services (A57205) — cms.gov; accessed 2026-07-27.
5. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
6. T31.41 — Burns involving 40-49% of body surface with 10-19% third degree burns | ICD-10 Code · Eleplan — eleplan.com; accessed 2026-07-27.