He's coughing a lot and the doctor said he has copd. Is COPD a communicable disease?

No. COPD (emphysema/chronic bronchitis) is not a communicable disease. It usually occurs in past or current smokers and can sometimes have a genetic predisposition (ie patients with Alpha one antitrypsin deficiency). One patient cannot typically give another patient the disease by cough, touch, kissing, etc.
No... Copd, chronic obstructive pulmonary disease, is a lung disease usually caused by smoking. Emphysema and chronic bronchitis are forms of copd. Smoking cessation is needed. Other treatments are determined by your doctor. It is a slowly progressive disease that is incurable.
No, it is not. COPD is not contagious at all. It is damage to the lung from smoking. You can't "catch" copd. If you smoke or inhale smoke, you can possibly get copd, though.
No. COPD is a chronic disease of the airways usually brought on by smoking. It is not contagious. It can be manged with medications and greatly improved if the patient stops smoking.