2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Other And Unspecified Effects Of External Causes 990-995 > ICD-9-CM Diagnosis 991 Effects of reduced temperature 991 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 991.0 Frostbite of face 991.0 is a specific code that can be used to specify a diagnosis 991.0 contains 1 index entry ICD-9-CM Diagnosis 991.1 Frostbite of hand 991.1 is a specific code that can be used to specify a diagnosis 991.1 contains 1 index entry ICD-9-CM Diagnosis 991.2 Frostbite of foot 991.2 is a specific code that can be used to specify a diagnosis 991.2 contains 1 index entry ICD-9-CM Diagnosis 991.3 Frostbite of other and unspecified sites 991.3 is a specific code that can be used to specify a diagnosis 991.3 contains 2 index entries ICD-9-CM Diagnosis 991.4 Immersion foot A condition of the feet produced by prolonged exposure of the feet to water. Exposure for 48 hours or more to warm water causes tropical immersion foot or warm-water immersion foot common in Vietnam where troops were exposed to prolonged or repeated wading in paddy fields or streams. Trench foot results from prolonged exposure to cold, without actual freezing. It was common in trench warfare during World War I, when soldiers stood, sometimes for hours, in trenches with a few inches of cold water in them. 991.4 is a specific code that can be used to specify a diagnosis 991.4 contains 13 index entries ICD-9-CM Diagnosis 991.5 Chilblains Recurrent localized itching, swelling and painful erythema on the fingers, toes or ears, produced by exposure to cold. It is also called pernio. 991.5 is a specific code that can be used to specify a diagnosis 991.5 contains 6 index entries ICD-9-CM Diagnosis 991.6 Hypothermia 991.6 is a specific code that can be used to specify a diagnosis 991.6 contains 2 index entries ICD-9-CM Diagnosis 991.8 Other specified effects of reduced temperature 991.8 is a specific code that can be used to specify a diagnosis 991.8 contains 12 index entries ICD-9-CM Diagnosis 991.9 Unspecified effect of reduced temperature 991.9 is a specific code that can be used to specify a diagnosis 991.9 contains 12 index entries