T34.42 ICD-10-CM Code: Frostbite with tissue necrosis 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
Frostbite with tissue necrosis of left arm is a non-billable ICD-10-CM category code (T34.42). A more specific billable subcode must be selected for claims submission.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T34.42 in the official ICD-10-CM tabular list.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- frostbite with tissue necrosis of wrist and hand (T34.5-)
- hypothermia and other effects of reduced temperature (T68, T69.-)
Frequently Asked Questions (FAQ) & Clinical Guidance
Can T34.42 be billed directly?
No. T34.42 (Frostbite with tissue necrosis 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 T34.42 require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T34.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to T34.42 in its code family, with their registry titles.
- T34.40XS — Frostbite with tissue necrosis of unspecified arm, sequela
- T34.41 — Frostbite with tissue necrosis of right arm
- T34.41XA — Frostbite with tissue necrosis of right arm, initial encounter
- T34.41XD — Frostbite with tissue necrosis of right arm, subsequent encounter
- T34.41XS — Frostbite with tissue necrosis of right arm, sequela
- T34.42XA — Frostbite with tissue necrosis of left arm, initial encounter
- T34.42XD — Frostbite with tissue necrosis of left arm, subsequent encounter
- T34.42XS — Frostbite with tissue necrosis of left arm, sequela
- T34.5 — Frostbite with tissue necrosis of wrist, hand, and finger(s)
- T34.51 — Frostbite with tissue necrosis of wrist