Mohs Microsurgery

During Mohs micrographic surgery, the surgeon removes three stages until finding clear margins. The first stage includes six blocks. The second stage includes five blocks. The final stage includes four blocks. The location is the left shoulder. What is the appropriate coding to describe these services?

I tried it, is it correct

17311 (Stage 1), 17312 x 2 (Stage 2 & 3) , 17315 (additional one block of Stage 1)