ICD-10-CM Tabular Index · Chapter 19 · FY 2027 T20–T25
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 2027. The section is organized into the 6 code ranges listed below.
✓ Built from the official CMS FY 2027 datasetEffective Oct 1, 2026 – Sep 30, 2027
6
Code Ranges
3,334
Diagnosis Codes
2,304
Billable Codes
T20–T25
Code Range
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.
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
Burns and corrosions, such as chemical burns, are organized by where they affect the outside of the body.
T20 covers the head, face, and neck; T21 covers the trunk. T22 covers the shoulder and upper limb, but the wrist and hand have their own category, T23. Likewise, T24 covers the lower limb except the ankle and foot, which fall under T25.
Within each area, subdivisions distinguish burns from corrosions and identify first, second, third, or unspecified degree. The final character distinguishes an initial encounter (A), a subsequent encounter (D), or a lasting effect (S).
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 2027. 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.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
The appropriate 7th character is to be added to each code from category T20
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
burns and corrosion of hip region
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
The appropriate 7th character is to be added to each code from category T21
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
The appropriate 7th character is to be added to each code from category T22
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
The appropriate 7th character is to be added to each code from category T23
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
The appropriate 7th character is to be added to each code from category T24
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
The appropriate 7th character is to be added to each code from category T25
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
