These are 5 position alpha-numeric codes comprising the d series. All other level II codes and descriptors are approved and maintained jointly by the alpha-numeric editorial panel (consisting of CMS, the Health Insurance Association of America, and the Blue Cross and Blue Shield Association).
Alaska: Although Alaska enjoys a high volume of aurora activity, its cruises are not often mentioned as northern lights cruises. During the Alaska cruise season, it's rarely dark enough for the lights to be visible.
1. Fairbanks, Alaska. Fairbanks may be one of the northernmost cities in the United States, but it may not be north enough to enjoy the Northern Lights. There are, however, tours that are specifically designed to take people north past the Arctic Circle so that they can experience the Northern Lights.