It is the treatment of choice for lesions 2 cm or larger.
There are certain criteria that determine when Mohs surgery is appropriate. Mohs surgery may be appropriate for a skin cancer on the back in certain situations (depending on size of tumor, pathology type, recurrent tumor, etc.). However, in many cases non-Mohs treatment is appropriate. I hope this answers your question. Please have a discussion with your board certified dermatologist about your specific scenario.
Darshan Vaidya, MD, FAAD