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T21.66

⚠ Non-billable (Header)

Corrosion of second degree of male genital region

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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Also Known As

Corrosion of second degree of penisCorrosion of second degree of scrotumCorrosion of second degree of testis

⚠️ Excludes2

inherited

Rules inherited from parent codes.

T21
  • • burns and corrosion of axilla (T22.- with fifth character 4)
  • • burns and corrosion of scapular region (T22.- with fifth character 6)
  • • burns and corrosion of shoulder (T22.- with fifth character 5)

📋 Code Instructions

inherited
T21.6
  • • external cause code to identify place (Y92)
  • • Code first: (T51-T65) to identify chemical and intent

Child Codes (3)

T21.66XACorrosion of second degree of male genital region, initial encounterT21.66XDCorrosion of second degree of male genital region, subsequent encounterT21.66XSCorrosion of second degree of male genital region, sequela

Clinical Description

ICD-10-CM code T21.66 represents corrosion of second degree of male genital region. 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 T21.66.

Frequently Asked Questions

What is ICD-10 code T21.66?

ICD-10-CM code T21.66 is "Corrosion of second degree of male genital region". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).

Is T21.66 a billable ICD-10 code?

No, T21.66 is a non-billable header code. A more specific child code must be used for billing.

Can T21.66 be coded with other codes?

T21.66 has 3 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in T21.6

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

T21.60Corrosion of second degree of trunk, unspecified siteT21.61Corrosion of second degree of chest wallT21.62Corrosion of second degree of abdominal wallT21.63Corrosion of second degree of upper backT21.64Corrosion of second degree of lower backT21.65Corrosion of second degree of buttockT21.67Corrosion of second degree of female genital regionT21.69Corrosion of second degree of other site of trunk

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Code Information

CodeT21.66
BillableNo — Header code
ParentT21.6
CategoryInjury, poisoning and certain other consequences of external causes (S00-T88)
Excludes10 rule(s)
Excludes23 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)