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ICD-10/T21.04

T21.04 ICD-10-CM Code: Burn of unspecified degree of lower back

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Burn of unspecified degree of lower back is a non-billable ICD-10-CM category code (T21.04). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T21.04 in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • burns and corrosion of hip region
  • burns and corrosions of first degree [erythema]
  • burns and corrosions of second degree [blisters][epidermal loss]
  • burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

  • 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)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • external cause code to identify the source, place and intent of the burn (X00-X19, X75-X77, X96-X98, Y92)
  • Use additional code from category T31 or T32 to identify extent of body surface involved

Frequently Asked Questions (FAQ) & Clinical Guidance

Can T21.04 be billed directly?

No. T21.04 (Burn of unspecified degree of lower back) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does T21.04 require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T21.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T21.04 in its code family, with their registry titles.

  • T21.02XS — Burn of unspecified degree of abdominal wall, sequela
  • T21.03 — Burn of unspecified degree of upper back
  • T21.03XA — Burn of unspecified degree of upper back, initial encounter
  • T21.03XD — Burn of unspecified degree of upper back, subsequent encounter
  • T21.03XS — Burn of unspecified degree of upper back, sequela
  • T21.04XA — Burn of unspecified degree of lower back, initial encounter
  • T21.04XD — Burn of unspecified degree of lower back, subsequent encounter
  • T21.04XS — Burn of unspecified degree of lower back, sequela
  • T21.05 — Burn of unspecified degree of buttock
  • T21.05XA — Burn of unspecified degree of buttock, initial encounter

View all codes in the T21 family

Indexed Clinical Terms (1)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Burn (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal), back (lower)