T21.64 Corrosion of second degree of lower back

The ICD-10-CM code for Corrosion of second degree of lower back is T21.64 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

T20-T25: Burns and corrosions of external body surface, specified by site (T20-T25)

Category T21

81 codes (72 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to T21.64:

• Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › back (lower) › second degree

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool

Cite This Page

Reference T21.64 with the canonical source and edition:

T21.64 — Corrosion of second degree of lower back. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/T21.64

Canonical URL: https://icd10codingpro.com/codes/T21.64