Are they doing a Topaz procedure to the plantar fascia? It's just the name of the tool they use not the procedure and can be coded as you would normally code a plantar fasciotomy
This is a little old but from the AMA website
KB #: 5468
Date: 09/29/2009
Surgery
Musculoskeletal System
Question
What is the appropriate code to report when the -TOPAZ device is used to perform a procedure?
Answer
The TOPAZ MicroDebrider is a tool which utilizes Coblation® technology to perform a small incision in the fascia and is considered an alternative to the use of standard surgical instruments such as scalpels, low frequency electrocautery, and so forth. This technology enables the microdebridement of soft tissue present within the tendons of the knee, shoulder, elbow, ankle and foot. Because the TOPAZ MicroDebrider is a tool and not a procedure, code selection will depend on the service performed, and the specific anatomy involved, as it can be used on different parts of the body. The appropriate code should be selected based on the definitive procedure being performed as described in the code descriptor.