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.
Northern lights holidays. Where to see the lights. Northern Lights Holidays. In our 34 years' experience of arranging holidays to see the northern lights we've discovered the best places to view this incredible phenomenon and we're excited to share them with you.