This is what I found out about the TOPAZ procedure:
The TOPAZ MicroDebrider is a wand-like device about the diameter of a pencil tip. Through a small incision, generally an inch in length, the physician applies the device to the problem tendon for multiple 500 millisecond intervals of treatment. By combining low temperature radiofrequency energy with saline, a charged plasma gas is formed at the tip of the TOPAZ wand and is precisely directed into and through the damaged tissues. From start to finish, the whole process takes less than 20 minutes.
However, I had a hard time finding a code and with further research it sounds as if this is a low extracorporeal shockwave for ortho (also found information on the web). If this is the case you may want to look at cat III code 0019t.
Hope this helps!
Tina