A new study (Oct 14) claims performing a single yoga pose for 90 seconds for at least 3 days a week could reduce spine curvature in patients with scoliosis in as little as 3 months. You can read the full article here.
There are many systems of yoga. Basically, most yoga systems are intended to improve muscles through stretching, holding positions, and breathing exercises. Some yoga systems also include meditation. How much it will help with back problems is not proven, but those with back pain may be helped. Your general health also may improve. Insurance may or may not cover treatment.
Below are some useful links for more information on yoga and how it can help scoliosis: