T33.819A Superficial frostbite of unspecified ankle, initial encounter

Billable ICD-10-CM code, FY2026.

Built from T33.819 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 T33.819A

Back-references to T33.8

• Type 2 Excludes: T33.7 Superficial frostbite of knee and lower leg ("superficial frostbite of ankle and foot (T33.8-)")

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

• T33.812 Superficial frostbite of left ankle
• T33.812A Superficial frostbite of left ankle, initial encounter
• T33.812D Superficial frostbite of left ankle, subsequent encounter
• T33.812S Superficial frostbite of left ankle, sequela
• T33.819 Superficial frostbite of unspecified ankle
• T33.819A Superficial frostbite of unspecified ankle, initial encounter (this code)
• T33.819D Superficial frostbite of unspecified ankle, subsequent encounter
• T33.819S Superficial frostbite of unspecified ankle, sequela
• T33.82 Superficial frostbite of foot
• T33.821 Superficial frostbite of right foot
• T33.821A Superficial frostbite of right foot, initial encounter