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.
During the winter months, the opportunity to see the Northern Lights increases the further north you travel. For the greatest likelihood of observing the Northern Lights, Iâd suggest planning a visit to Fairbanks or Interior Alaska.