X31 Exposure to excessive natural cold

Excessive cold as the cause of chilblains NOS
Excessive cold as the cause of immersion foot or hand
Exposure to cold NOS
Exposure to weather conditions

Excludes1: cold of man-made origin (W93.-)
contact with or inhalation of dry ice (W93.-)
contact with or inhalation of liquefied gas (W93.-)

7th character: The appropriate 7th character is to be added to code X31
7th character definitions: initial encounter
subsequent encounter
sequela