ICD-10-CM 2027 diagnosis code
T21.01XABurn of unspecified degree of chest wall, initial encounter
T21.01XA is a valid, billable ICD-10-CM code for burn of unspecified degree of chest wall, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
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 T21.01XA
T21.01XA is the ICD-10-CM diagnosis code for burn of unspecified degree of chest wall, initial encounter. It belongs to category T21 (burn and corrosion of trunk), 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 billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 935 (Non-Extensive Burns, relative weight 2.4243), in MDC 22 (Burns), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 942.01 (burn of unspecified degree of breast) and 942.02 (burn of unspecified degree of chest wall, excluding breast and nipple).
7th character
Ainitial encounter
Other encounter types for T21.01:
Notes that apply from higher levels
Instructions written at a parent level also apply to T21.01XA.
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.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 22 · Burns
ICD-9-CM equivalent
Converter →- 942.01Burn of unspecified degree of breastapproximate
- 942.02Burn of unspecified degree of chest wall, excluding breast and nippleapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
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 T21.01XA
Is T21.01XA billable?
- Yes. T21.01XA is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "A" at the end of T21.01XA mean?
- It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.
Can T21.01XA be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict T21.01XA as a principal diagnosis.
Is T21.01XA a CC or MCC?
- No. T21.01XA is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does T21.01XA group to?
- T21.01XA is used in the MS-DRG v44.0 logic for MS-DRG 935 (Non-Extensive Burns). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for T21.01XA?
- The CMS General Equivalence Mappings map T21.01XA to ICD-9-CM 942.01 and 942.02.