ICD-10-CM 2027 diagnosis code
T21Burn and corrosion of trunk
T21 is a header code, so it can't be reported by itself. Choose one of the 8 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About T21
T21 is the ICD-10-CM diagnosis code for burn and corrosion of trunk. It belongs to block T20-T25 (burns and corrosions of external body surface, specified by site) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 8 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: T21.0 (trunk), T21.1 (trunk), T21.2 (trunk), T21.3 (trunk), T21.4 (trunk), T21.5 (trunk), T21.6 (trunk) and T21.7 (trunk).
The conditions in its Excludes2 note aren't part of T21, but may be coded alongside it if the patient has both: burns and corrosion of axilla (T22.- with fifth character 4), burns and corrosion of scapular region (T22.- with fifth character 6) and burns and corrosion of shoulder (T22.- with fifth character 5).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under T21
- T21.0Burn of unspecified degree of trunk
- T21.00Burn of unspecified degree of trunk, unspecified site
- T21.01Burn of unspecified degree of chest wall
- T21.02Burn of unspecified degree of abdominal wall
- T21.03Burn of unspecified degree of upper back
- T21.04Burn of unspecified degree of lower back
- T21.05Burn of unspecified degree of buttock
- T21.06Burn of unspecified degree of male genital region
- T21.07Burn of unspecified degree of female genital region
- T21.09Burn of unspecified degree of other site of trunk
- T21.1Burn of first degree of trunk
- T21.10Burn of first degree of trunk, unspecified site
- T21.11Burn of first degree of chest wall
- T21.12Burn of first degree of abdominal wall
- T21.13Burn of first degree of upper back
- T21.14Burn of first degree of lower back
- T21.15Burn of first degree of buttock
- T21.16Burn of first degree of male genital region
- T21.17Burn of first degree of female genital region
- T21.19Burn of first degree of other site of trunk
- T21.2Burn of second degree of trunk
- T21.20Burn of second degree of trunk, unspecified site
- T21.21Burn of second degree of chest wall
- T21.22Burn of second degree of abdominal wall
- T21.23Burn of second degree of upper back
- T21.24Burn of second degree of lower back
- T21.25Burn of second degree of buttock
- T21.26Burn of second degree of male genital region
- T21.27Burn of second degree of female genital region
- T21.29Burn of second degree of other site of trunk
- T21.3Burn of third degree of trunk
- T21.30Burn of third degree of trunk, unspecified site
- T21.31Burn of third degree of chest wall
- T21.32Burn of third degree of abdominal wall
- T21.33Burn of third degree of upper back
- T21.34Burn of third degree of lower back
- T21.35Burn of third degree of buttock
- T21.36Burn of third degree of male genital region
- T21.37Burn of third degree of female genital region
- T21.39Burn of third degree of other site of trunk
- T21.4Corrosion of unspecified degree of trunk
- T21.40Corrosion of unspecified degree of trunk, unspecified site
- T21.41Corrosion of unspecified degree of chest wall
- T21.42Corrosion of unspecified degree of abdominal wall
- T21.43Corrosion of unspecified degree of upper back
- T21.44Corrosion of unspecified degree of lower back
- T21.45Corrosion of unspecified degree of buttock
- T21.46Corrosion of unspecified degree of male genital region
- T21.47Corrosion of unspecified degree of female genital region
- T21.49Corrosion of unspecified degree of other site of trunk
- T21.5Corrosion of first degree of trunk
- T21.50Corrosion of first degree of trunk, unspecified site
- T21.51Corrosion of first degree of chest wall
- T21.52Corrosion of first degree of abdominal wall
- T21.53Corrosion of first degree of upper back
- T21.54Corrosion of first degree of lower back
- T21.55Corrosion of first degree of buttock
- T21.56Corrosion of first degree of male genital region
- T21.57Corrosion of first degree of female genital region
- T21.59Corrosion of first degree of other site of trunk
- T21.6Corrosion of second degree of trunk
- T21.60Corrosion of second degree of trunk, unspecified site
- T21.61Corrosion of second degree of chest wall
- T21.62Corrosion of second degree of abdominal wall
- T21.63Corrosion of second degree of upper back
- T21.64Corrosion of second degree of lower back
- T21.65Corrosion of second degree of buttock
- T21.66Corrosion of second degree of male genital region
- T21.67Corrosion of second degree of female genital region
- T21.69Corrosion of second degree of other site of trunk
- T21.7Corrosion of third degree of trunk
- T21.70Corrosion of third degree of trunk, unspecified site
- T21.71Corrosion of third degree of chest wall
- T21.72Corrosion of third degree of abdominal wall
- T21.73Corrosion of third degree of upper back
- T21.74Corrosion of third degree of lower back
- T21.75Corrosion of third degree of buttock
- T21.76Corrosion of third degree of male genital region
- T21.77Corrosion of third degree of female genital region
- T21.79Corrosion of third degree of other site of trunk
Coding notes
- burns and corrosion of hip region
Notes that apply from higher levels
Instructions written at a parent level also apply to T21.
Broader instructions also apply from T20-T25 Burns and corrosions of external body surface, specified by site and Chapter 19: Injury, poisoning and certain other consequences of external causes.
Codes whose notes reference T21
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about T21
Is T21 billable?
- No. T21 is a header code. Report one of its more specific subcodes instead.