T33.539A Superficial frostbite of unspecified finger(s), initial encounter

Billable ICD-10-CM code, FY2026.

Built from T33.539 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

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to T33.539A

Back-references to T33.53

• Type 2 Excludes: T33.52 Superficial frostbite of hand ("superficial frostbite of fingers (T33.53-)")

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

• T33.532 Superficial frostbite of left finger(s)
• T33.532A Superficial frostbite of left finger(s), initial encounter
• T33.532D Superficial frostbite of left finger(s), subsequent encounter
• T33.532S Superficial frostbite of left finger(s), sequela
• T33.539 Superficial frostbite of unspecified finger(s)
• T33.539A Superficial frostbite of unspecified finger(s), initial encounter (this code)
• T33.539D Superficial frostbite of unspecified finger(s), subsequent encounter
• T33.539S Superficial frostbite of unspecified finger(s), sequela
• T33.6 Superficial frostbite of hip and thigh
• T33.60 Superficial frostbite of unspecified hip and thigh
• T33.60XA Superficial frostbite of unspecified hip and thigh, initial encounter