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ICD-10/T33.90

T33.90 ICD-10-CM Code: Superficial frostbite of unspecified sites

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

Superficial frostbite of unspecified sites is a non-billable ICD-10-CM category code (T33.90). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T33.90 in the official ICD-10-CM tabular list.

Includes

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

  • frostbite with partial thickness skin loss

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Superficial frostbite NOS

Excludes2 — Not Included Here

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

  • hypothermia and other effects of reduced temperature (T68, T69.-)

Frequently Asked Questions (FAQ) & Clinical Guidance

Can T33.90 be billed directly?

No. T33.90 (Superficial frostbite of unspecified sites) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does T33.90 require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T33.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T33.90 in its code family, with their registry titles.

  • T33.839 — Superficial frostbite of unspecified toe(s)
  • T33.839A — Superficial frostbite of unspecified toe(s), initial encounter
  • T33.839D — Superficial frostbite of unspecified toe(s), subsequent encounter
  • T33.839S — Superficial frostbite of unspecified toe(s), sequela
  • T33.9 — Superficial frostbite of other and unspecified sites
  • T33.90XA — Superficial frostbite of unspecified sites, initial encounter
  • T33.90XD — Superficial frostbite of unspecified sites, subsequent encounter
  • T33.90XS — Superficial frostbite of unspecified sites, sequela
  • T33.99 — Superficial frostbite of other sites
  • T33.99XA — Superficial frostbite of other sites, initial encounter

View all codes in the T33 family

Indexed Clinical Terms (1)

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

  • Frostbite (superficial)