Treating high bilirubin levels focuses on eliminating the underlying cause of the increase and reducing the possibility of future liver damage, states Chemocare. Normal bilirubin levels range from about 0.2 to 1.2 milligrams per deciliter, and jaundice typically appears when the patient's level is over 3.0 milligrams per deciliter.
If a blocked bile duct is causing the elevated bilirubin level, a doctor can perform an endoscopic procedure to open the bile duct. If the cause is acute viral hepatitis, as the liver's condition improves, the bilirubin levels decline and treatment may not be needed, notes Merck Manuals. Babies with high bilirubin levels may receive phototherapy, during which they are placed under special lighting to help disperse the excess bilirubin in their skin, according to MedlinePlus.