T33.40 is the authoritative medical code for Superficial frostbite of unspecified arm. This classification is used in medical billing and clinical recording to specify the clinical criteria for superficial frostbite of unspecified arm (ICD-10-CM T33.40), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Superficial frostbite of unspecified arm is a non-billable ICD-10-CM category code T33.40. A more specific billable subcode must be selected for claims submission. Includes: frostbite with partial thickness skin loss. Excludes2 (not included here): superficial frostbite of wrist and hand T33.5-; hypothermia and other effects of reduced temperature (T68, T69.-). 7th character: The appropriate 7th character is to be added to each code from category T33.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T33.40 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 T33.40 be billed directly?
No. T33.40 (Superficial frostbite of unspecified arm) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does T33.40 require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T33.
Can T33.40 be reported alongside related conditions?
Per Excludes2 instructions, T33.40 and the following may both be reported when both are present: superficial frostbite of wrist and hand (T33.5-); hypothermia and other effects of reduced temperature (T68, T69.-).
Codes in This Family (40)
Official ICD-10-CM classifications in the same code family as T33.40, with their registry titles.
- T33 — Superficial frostbite
- T33-T34 — Frostbite (T33-T34)
- T33.0 — Superficial frostbite of head
- T33.01 — Superficial frostbite of ear
- T33.011 — Superficial frostbite of right ear
- T33.011A — Superficial frostbite of right ear, initial encounter
- T33.011D — Superficial frostbite of right ear, subsequent encounter
- T33.011S — Superficial frostbite of right ear, sequela
- T33.012 — Superficial frostbite of left ear
- T33.012A — Superficial frostbite of left ear, initial encounter
- T33.012D — Superficial frostbite of left ear, subsequent encounter
- T33.012S — Superficial frostbite of left ear, sequela
- T33.019 — Superficial frostbite of unspecified ear
- T33.019A — Superficial frostbite of unspecified ear, initial encounter
- T33.019D — Superficial frostbite of unspecified ear, subsequent encounter
- T33.019S — Superficial frostbite of unspecified ear, sequela
- T33.02 — Superficial frostbite of nose
- T33.02XA — Superficial frostbite of nose, initial encounter
- T33.02XD — Superficial frostbite of nose, subsequent encounter
- T33.02XS — Superficial frostbite of nose, sequela
- T33.09 — Superficial frostbite of other part of head
- T33.09XA — Superficial frostbite of other part of head, initial encounter
- T33.09XD — Superficial frostbite of other part of head, subsequent encounter
- T33.09XS — Superficial frostbite of other part of head, sequela
- T33.1 — Superficial frostbite of neck
- T33.1XXA — Superficial frostbite of neck, initial encounter
- T33.1XXD — Superficial frostbite of neck, subsequent encounter
- T33.1XXS — Superficial frostbite of neck, sequela
- T33.2 — Superficial frostbite of thorax
- T33.2XXA — Superficial frostbite of thorax, initial encounter
- T33.2XXD — Superficial frostbite of thorax, subsequent encounter
- T33.2XXS — Superficial frostbite of thorax, sequela
- T33.3 — Superficial frostbite of abdominal wall, lower back and pelvis
- T33.3XXA — Superficial frostbite of abdominal wall, lower back and pelvis, initial encounter
- T33.3XXD — Superficial frostbite of abdominal wall, lower back and pelvis, subsequent encounter
- T33.3XXS — Superficial frostbite of abdominal wall, lower back and pelvis, sequela
- T33.4 — Superficial frostbite of arm
- T33.40XA — Superficial frostbite of unspecified arm, initial encounter
- T33.40XD — Superficial frostbite of unspecified arm, subsequent encounter
- T33.40XS — Superficial frostbite of unspecified arm, sequela
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code T31.40
Burns involving 40-49% of body surface with 0% to 9% third degree burns
ICD Code T32.40
Corrosions involving 40-49% of body surface with 0% to 9% third degree corrosion