Alphabetic Index FY2027

T28.6XXA

Corrosion of esophagus, initial encounter

FY2027Chapter 19: Injury, poisoning and certain other consequences of external causes/T26–T28 Burns and corrosions confined to eye and internal organs

BillableComplete code, valid to report
Care settingsHospital CCHAC

T28.6XXA (also written T286XXA) is a billable ICD-10-CM diagnosis code for corrosion of esophagus, initial encounter. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 54 codes in category T28 (Burn and corrosion of other internal organs). The Alphabetic Index lists it under 3 entries. Its 7th character, A, means initial encounter. Its coding notes include a Code first instruction, a Use additional code instruction and 2 Excludes2 entries.

7th character

Category T28 requires a 7th character. T28.6 has only 4 characters, so a placeholder X fills the empty positions.

Assembled code T28.6XXA Open code

Guidelines tips

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.

Guidelines I.C.19.aInjuries: application of 7th charactersRead the official text

Late effects of burns are coded with 7th character S, and a current burn and a sequela of an old burn can be coded together. An external cause code is used with burns.

Guidelines I.C.19.d.7; I.C.19.d.8; I.C.19.d.9Burn sequelae and external causeRead the official text

Code first

If the underlying condition listed here is present and known, sequence it first.

Inherited from T28.6 Corrosion of esophagus
  • (T51-T65) to identify chemical and intent

Use additional code

Add the listed code as a secondary code, if known.

Inherited from T28 Burn and corrosion of other internal organs
  • 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)
Also from chapter/block level (1 note)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • code to identify any retained foreign body, if applicable (Z18.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (2 notes)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Hospital CC

Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 14 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.

Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix C

HAC

On the CMS list of hospital-acquired conditions (HAC 05: Falls and Trauma). When the claim reports it with a present-on-admission (POA) indicator of N (not present) or U (documentation insufficient), CMS does not pay the CC or MCC DRG for it. A POA of Y (present) or W (clinically undetermined) is paid normally.

Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix I; CMS Hospital-Acquired Conditions (HAC) Coding page, POA indicator payment table

Notes

Also from chapter/block level (2 notes)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

Alphabetic Index terms

Terms the official Alphabetic Index lists for T28.6. This code adds the 7th character. 3 entries