T20.71

⚠ Non-billable (Header)

Corrosion of third degree of ear [any part, except ear drum]

Injury, poisoning and certain other consequences of external causes (S00-T88)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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⚠️ Excludes2

direct

Both codes can exist if both conditions are documented.

• corrosion of ear drum (T28.91-)

⚠️ Excludes2

inherited

Rules inherited from parent codes.

T20

• 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

T20.7

• external cause code to identify place (Y92)
• Code first: (T51-T65) to identify chemical and intent

Child Codes (3)

T20.711Corrosion of third degree of right ear [any part, except ear drum]Header T20.712Corrosion of third degree of left ear [any part, except ear drum]Header T20.719Corrosion of third degree of unspecified ear [any part, except ear drum]Header

Clinical Description

ICD-10-CM code T20.71 represents corrosion of third degree of ear [any part, except ear drum]. This code falls under the Injury, poisoning and certain other consequences of external causes (S00-T88) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 6-character code at the 5th level of specificity. There are 3 more specific child codes under T20.71.

Frequently Asked Questions

What is ICD-10 code T20.71?

ICD-10-CM code T20.71 is "Corrosion of third degree of ear [any part, except ear drum]". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).

Is T20.71 a billable ICD-10 code?

No, T20.71 is a non-billable header code. A more specific child code must be used for billing.

Can T20.71 be coded with other codes?

T20.71 has 4 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in T20.7

Other codes in the same category that may be relevant for differential coding:

T20.70Corrosion of third degree of head, face, and neck, unspecified site T20.72Corrosion of third degree of lip(s)T20.73Corrosion of third degree of chin T20.74Corrosion of third degree of nose (septum)T20.75Corrosion of third degree of scalp [any part]T20.76Corrosion of third degree of forehead and cheek T20.77Corrosion of third degree of neck T20.79Corrosion of third degree of multiple sites of head, face, and neck

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Code Information

CodeT20.71

BillableNo — Header code

ParentT20.7

CategoryInjury, poisoning and certain other consequences of external causes (S00-T88)

Excludes10 rule(s)

Excludes24 note(s)

Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)