T33.521A Superficial frostbite of right hand, initial encounter

Billable ICD-10-CM code, FY2026.

Built from T33.521 with 7th character A (initial encounter).

Applies from T33 Superficial frostbite

Includes

• frostbite with partial thickness skin loss

7th character note

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

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Applies from T33.52 Superficial frostbite of hand

Excludes2 (not included here)

• superficial frostbite of fingers (T33.53-)

Code annotations containing back-references to T33.521A

Back-references to T33.5

• Type 2 Excludes: T33.4 Superficial frostbite of arm ("superficial frostbite of wrist and hand (T33.5-)")

Back-references to T33

• Type 2 Excludes: I73 Other peripheral vascular diseases ("frostbite (T33-T34)")
• Type 2 Excludes: T68 Hypothermia ("frostbite (T33-T34)")
• Type 2 Excludes: T69 Other effects of reduced temperature ("frostbite (T33-T34)")

Nearby codes

• T33.519A Superficial frostbite of unspecified wrist, initial encounter
• T33.519D Superficial frostbite of unspecified wrist, subsequent encounter
• T33.519S Superficial frostbite of unspecified wrist, sequela
• T33.52 Superficial frostbite of hand
• T33.521 Superficial frostbite of right hand
• T33.521A Superficial frostbite of right hand, initial encounter (this code)
• T33.521D Superficial frostbite of right hand, subsequent encounter
• T33.521S Superficial frostbite of right hand, sequela
• T33.522 Superficial frostbite of left hand
• T33.522A Superficial frostbite of left hand, initial encounter
• T33.522D Superficial frostbite of left hand, subsequent encounter