Non-Billable / Non-Specific Code
ICD-10-CM T20.4 is the diagnosis code for Corrosion of unspecified degree of head, face, and neck. This code falls under the section "Burns and corrosions of external body surface, specified by site" within Chapter 19 — Injury, poisoning and certain other consequences of external causes (S00-T88). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where T20.4 sits in the ICD-10-CM classification helps ensure proper coding:
No, T20.4 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
T20.4 is the ICD-10-CM diagnosis code for "Corrosion of unspecified degree of head, face, and neck". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T20.4 is T20 ("Burn and corrosion of head, face, and neck"). T20.4 provides a more specific classification within this category.
T20.4 is located in Section T20-T25 — "Burns and corrosions of external body surface, specified by site" within Chapter 19 of the ICD-10-CM Tabular List.
T20.4 has 9 sub-code(s) that provide more specific detail: T20.40, T20.41, T20.42, T20.43, T20.44 and more.
Use T20.4 when the patients documented diagnosis matches "Corrosion of unspecified degree of head, face, and neck" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Corrosion of unspecified degree of head, face, and neck is T20.4.
No, T20.4 is non-billable. Use a more specific sub-code for primary diagnosis billing.
T20.4 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T20.4 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.