HVAC technicians are required to undergo and complete a minimum of six months up to two years of training. Training programs must be taken from technical schools accredited by organizations like HVAC Excellence or (PAHRA) the Partnership for Air-Conditioning, Heating Refrigeration Accreditation.
ICD-9-CM Volume 2 Index entries containing back-references to 783.1: 1  Abnormal, abnormality, abnormalities - see also Anomaly weight gain 783.1 of pregnancy 646.1 with hypertension - see Toxemia, of pregnancy. 2  Excess, excessive, excessively weight 278.02 gain 783.1 of pregnancy 646.1. 3  Gain, weight (abnormal) (excessive) (see also Weight, gain) 783.1.
Weight loss - unintentional. Unexplained weight loss is a decrease in body weight, when you did not try to lose the weight on your own. Many people gain and lose weight. Unintentional weight loss is loss of 10 pounds (4.5 kilograms) OR 5% of your normal body weight over 6 to 12 months or less without knowing the reason. Causes.