ABN stands for Advanced Beneficiary Notification. An ABN must be signed prior to providing a Medicare service or test to document that the patient is willing to assume responsibility for payment of services that Medicare may not cover when subject to either National or Local Coverage Determinations (NCD) or (LCD).
Chinchillas are crepuscular (most active around dawn and dusk) rodents, slightly larger and more robust than ground squirrels. They are native to the Andes mountains in South America and live in colonies called  herds  at high elevations up to 4,270 m (14,000 ft).
Cholla is a term applied to various shrubby cacti with segmented branches. The jumping cholla, Opuntia fulgida, is a very spiny cactus, usually a shrub, but sometimes more like a tree, with a number of irregular, jointed branches bearing sharp-barbed spines that are painful and difficult to remove.