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ICD-10 diagnosis code

T20.4 Corrosion of unspecified degree of head and neck

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T20.4 is the ICD-10 code for Corrosion of unspecified degree of head and neck. It is a four-character subcategory of T20 (Burn and corrosion of head and neck), the most specific level in the WHO edition. It belongs to the block T20–T25 (Burns and corrosions of external body surface, specified by site) in Chapter XIX, Injury, poisoning and certain other consequences of external causes.

Code type
Subcategory (4 characters)
Chapter
XIX · S00–T98
Classification
WHO ICD-10, 2019 version

T20.4 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

T20.4Frätskada av ospecificerad grad på huvudet och halsen

NorwayICD-10-NO

T20.4Etseskade av uspesifisert grad på hode eller hals

DenmarkICD-10-DK

DT204Ætsning UNS på hovedet og halsen

  • DT204AÆtsning UNS på hovedet
  • DT204BÆtsning UNS på halsen
FinlandICD-10-FI

T20.4Pään tai kaulan syvyysasteeltaan määrittämätön syöpymä

GermanyICD-10-GM

T20.4Verätzung nicht näher bezeichneten Grades des Kopfes und des Halses

FranceICD-10-FR

T20.4Corrosion de la tête et du cou, degré non précisé

NetherlandsICD-10-NL

T20.4etsing van niet-gespecificeerde graad van hoofd en hals

United StatesICD-10-CM

Listed through more specific codes:

  • T20.40XACorrosion of unspecified degree of head, face, and neck, unspecified site, initial encounter
  • T20.40XDCorrosion of unspecified degree of head, face, and neck, unspecified site, subsequent encounter
  • T20.40XSCorrosion of unspecified degree of head, face, and neck, unspecified site, sequela
  • T20.411ACorrosion of unspecified degree of right ear [any part, except ear drum], initial encounter
  • T20.411DCorrosion of unspecified degree of right ear [any part, except ear drum], subsequent encounter
  • T20.411SCorrosion of unspecified degree of right ear [any part, except ear drum], sequela
  • T20.412ACorrosion of unspecified degree of left ear [any part, except ear drum], initial encounter
  • T20.412DCorrosion of unspecified degree of left ear [any part, except ear drum], subsequent encounter
  • and 25 more national subcodes

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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