Exposure to excessive natural cold

**Inclusion terms:** - 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 note:** - The appropriate 7th character is to be added to code X31

**7th character:** - A: initial encounter - D: subsequent encounter - S: sequela