T20.40XA
✓ BillableCorrosion of unspecified degree of head, face, and neck, unspecified site, initial encounter
Injury, poisoning and certain other consequences of external causes (S00-T88)
⚠️ Excludes2
inheritedRules inherited from parent codes.
- • burn and corrosion of ear drum (T28.41, T28.91)
- • burn and corrosion of eye and adnexa (T26.-)
- • burn and corrosion of mouth and pharynx (T28.0)
📋 Code Instructions
inherited- • external cause code to identify place (Y92)
- • Code first: (T51-T65) to identify chemical and intent
Clinical Description
ICD-10-CM code T20.40XA represents corrosion of unspecified degree of head, face, and neck, unspecified site, initial encounter. This code falls under the Injury, poisoning and certain other consequences of external causes (S00-T88) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.
This is a 8-character code at the 7th level of specificity. This is the most specific code available in this subcategory.
Frequently Asked Questions
What is ICD-10 code T20.40XA?
ICD-10-CM code T20.40XA is "Corrosion of unspecified degree of head, face, and neck, unspecified site, initial encounter". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).
Is T20.40XA a billable ICD-10 code?
Yes, T20.40XA is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Can T20.40XA be coded with other codes?
T20.40XA has 3 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
Related Codes in T20.40
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)