Skip to content
Dx

ICD-10-CM 2027 diagnosis code

T28.90XACorrosions of unspecified internal organs, initial encounter

✓ Billable / specificRequires 7th character

T28.90XA is a valid, billable ICD-10-CM code for corrosions of unspecified internal organs, 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 T28.90XA

T28.90XA is the ICD-10-CM diagnosis code for Corrosions of unspecified internal organs, initial encounter. It belongs to category T28 (burn and corrosion of other internal organs), block T26-T28 (burns and corrosions confined to eye and internal organs) 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.

Use an additional code for: external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98) and external cause code to identify place (Y92).

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 947.9 (burn of internal organs, unspecified site).

7th character

Ainitial encounter

Other encounter types for T28.90:

Notes that apply from higher levels

Instructions written at a parent level also apply to T28.90XA.

› From T28.9 Corrosions of other and unspecified internal organs
Code first
  • (T51-T65) to identify chemical and intent
› From T28 Burn and corrosion of other internal organs
Use additional code
  • external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98)
  • external cause code to identify place (Y92)

Broader instructions also apply from 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.

ICD-9-CM equivalent

Converter →
  • 947.9Burn of internal organs, unspecified siteapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T28.90XA

Is T28.90XA billable?

Yes. T28.90XA 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 T28.90XA 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 T28.90XA be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict T28.90XA as a principal diagnosis.

Is T28.90XA a CC or MCC?

No. T28.90XA is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does T28.90XA group to?

T28.90XA 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 T28.90XA?

The CMS General Equivalence Mappings map T28.90XA to ICD-9-CM 947.9.