All ICD10 Codes

T21.4

Non-Billable
ChapterS00–T88
Ranksubcategory
Official Description

Corrosion of unspecified degree of trunk

Use a more specific code (9 billable)
T21.40Corrosion of unspecified degree of trunk, unspecified siteT21.41Corrosion of unspecified degree of chest wallT21.42Corrosion of unspecified degree of abdominal wallT21.43Corrosion of unspecified degree of upper backT21.44Corrosion of unspecified degree of lower backT21.45Corrosion of unspecified degree of buttockT21.46Corrosion of unspecified degree of male genital regionT21.47Corrosion of unspecified degree of female genital regionT21.49Corrosion of unspecified degree of other site of trunk
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

Instructional Notes

Code First
  • (T51-T65) to identify chemical and intent
Use Additional Code
  • external cause code to identify place (Y92)
General instructions are available for the parent sections:
View CH19 NotesView T20-T25 NotesView T21 Notes

Clinical Hierarchy

BillableHas subcodes
CH19Injury, poisoning and certain other consequences of external causes (S00-T88)
T20-T25Burns and corrosions of external body surface, specified by site (T20-T25)
T21Burn and corrosion of trunk
T21.4Corrosion of unspecified degree of trunkNot billable
T21.40Corrosion of unspecified degree of trunk, unspecified siteBillable
T21.41Corrosion of unspecified degree of chest wallBillable
T21.42Corrosion of unspecified degree of abdominal wallBillable
T21.43Corrosion of unspecified degree of upper backBillable
T21.44Corrosion of unspecified degree of lower backBillable
T21.45Corrosion of unspecified degree of buttockBillable
T21.46Corrosion of unspecified degree of male genital regionBillable
T21.47Corrosion of unspecified degree of female genital regionBillable
T21.49Corrosion of unspecified degree of other site of trunkBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to T21.4:

categoryT21
Burn and corrosion of trunk
View context instructions
blockT20-T25
Burns and corrosions of external body surface, specified by site (T20-T25)
View context instructions
chapterCH19
Injury, poisoning and certain other consequences of external causes (S00-T88)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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