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).
Chinchillas have dense fur. Over time, oils and moisture collect in the fur. In the wild, chinchillas have no way to clean their fur other than to roll around in volcanic ash which acts as an absorbent. Chinchillas do not go into water. Nor should you ever bathe your chinchilla in water. Doing so would remove the natural oils which protect a chinchilla's skin and helps them regulate their body temperature. Instead, it is best to give them a bowl or container filled with special dust for them to roll around in.