Memorial Sloan Kettering Skin Cancer Center Hauppauge provides state-of-the-art skin cancer care in a location that is convenient for residents of Long Island. For general information, call Memorial Sloan Kettering at 212-639-2000, 24 hours a day, seven days a week. To make an appointment, call us at 800-525-2225, Monday through Friday between 8:30 AM and 5:30 PM ET.