Burns and corrosions of external body surface, specified by site (T20-T25) ICD-10-CM
The T20–T25 section covers burns and corrosions of external body surface, specified by site with 3,334 ICD-10-CM diagnosis codes, of which 2,304 are billable in fiscal year 2026. The section is organized into the 6 code ranges listed below.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- 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
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
Code Ranges in This Section 6 ranges · 3,334 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the T20–T25 Code Range
ICD-10-CM codes T20-T25 are used to classify burns and corrosions affecting the external body surface, specifically identified by the site of injury. This range covers injuries to the head, face, neck (T20), trunk (T21), shoulder and upper limb except wrist and hand (T22), wrist and hand (T23), lower limb except ankle and foot (T24), and ankle and foot (T25).
Each category in this range differentiates burns and corrosions by degree—unspecified, first, second, or third degree—and by specific locations within the region. For instance, for the head, face, and neck (T20), there are codes for burns of lips, ears (including right, left, or unspecified), nose (including the septum), scalp, forehead, cheek, and neck, with synonyms like "burn of pinna" or "burn of preauricular region" aiding accurate coding. These codes also account for the stage of care with seventh-character extensions indicating initial encounter, subsequent encounter, and sequela (complications or conditions following burns). This detailed classification helps precisely capture the severity and specific site of burns or corrosions, such as "partial thickness burn" or "chemical burn," for clear clinical documentation and coding purposes.
Overall, codes within T20-T25 enable detailed reporting of burn and corrosion injuries across all major body regions, tailored by anatomical site and burn degree, including stages of treatment, facilitating comprehensive coding for medical records and billing.
Questions About This Page
How many codes are in the T20-T25 range?
The T20-T25 range contains 3,334 ICD-10-CM diagnosis codes in FY 2026. 2,304 of them are billable, and the rest are category headers that organize the section.
What conditions does T20-T25 cover?
The range covers burns and corrosions of external body surface, specified by site. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
