All ICD10 Codes

T20.4

Non-Billable
ChapterS00–T88
Ranksubcategory
Official Description

Corrosion of unspecified degree of head, face, and neck

Use a more specific code (8 billable, 1 non-billable)
T20.40Corrosion of unspecified degree of head, face, and neck, unspecified siteT20.41Corrosion of unspecified degree of ear [any part, except ear drum]has subcodesT20.42Corrosion of unspecified degree of lip(s)T20.43Corrosion of unspecified degree of chinT20.44Corrosion of unspecified degree of nose (septum)T20.45Corrosion of unspecified degree of scalp [any part]T20.46Corrosion of unspecified degree of forehead and cheekT20.47Corrosion of unspecified degree of neckT20.49Corrosion of unspecified degree of multiple sites of head, face, and neck
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 T20 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)
T20Burn and corrosion of head, face, and neck
T20.4Corrosion of unspecified degree of head, face, and neckNot billable
T20.40Corrosion of unspecified degree of head, face, and neck, unspecified siteBillable
T20.41Corrosion of unspecified degree of ear [any part, except ear drum]Subcodes
T20.42Corrosion of unspecified degree of lip(s)Billable
T20.43Corrosion of unspecified degree of chinBillable
T20.44Corrosion of unspecified degree of nose (septum)Billable
T20.45Corrosion of unspecified degree of scalp [any part]Billable
T20.46Corrosion of unspecified degree of forehead and cheekBillable
T20.47Corrosion of unspecified degree of neckBillable
T20.49Corrosion of unspecified degree of multiple sites of head, face, and neckBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to T20.4:

categoryT20
Burn and corrosion of head, face, and neck
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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