T33.42 ICD-10-CM Code: Superficial frostbite of left arm
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
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T33.42 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
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- superficial frostbite of wrist and hand (T33.5-)
- hypothermia and other effects of reduced temperature (T68, T69.-)
Frequently Asked Questions (FAQ) & Clinical Guidance
Can T33.42 be billed directly?
No. T33.42 (Superficial frostbite of left arm) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does T33.42 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 T33.42 in its code family, with their registry titles.
- T33.40XS — Superficial frostbite of unspecified arm, sequela
- T33.41 — Superficial frostbite of right arm
- T33.41XA — Superficial frostbite of right arm, initial encounter
- T33.41XD — Superficial frostbite of right arm, subsequent encounter
- T33.41XS — Superficial frostbite of right arm, sequela
- T33.42XA — Superficial frostbite of left arm, initial encounter
- T33.42XD — Superficial frostbite of left arm, subsequent encounter
- T33.42XS — Superficial frostbite of left arm, sequela
- T33.5 — Superficial frostbite of wrist, hand, and fingers
- T33.51 — Superficial frostbite of wrist