There is only four liposuction codes by body part. They do not differentiate by WAL, PAL, US or technique. Just one code. Technically I would be sure all documentation concerning treating lipedema as tumescent, lymph-sparing liposuction. That covers it well enough. There are a couple of studies that specifically reference WAL. Again, only one code.
Anthem Blue Cross CA reimburses for liposuction for lipedema: NC00009; Cosmetic and Reconstructive Services Published 11/12/2019.
Numerous board-certified plastic surgeons have filed medical insurance claims for lymph-sparing, tumescent liposuction and been reimbursed including: Dr David Gruener, NY, Marcia V. Byrd, M.D., GA, Gayle Gordillo, MD, IN, and Dr. David Amron, CA. Unfortunately no one has been able to give me any specifics.
In a 2017 review of reimbursement for 27 advanced, disabled lipedema patients who underwent lymph-saving tumescent, liposuction, 6 were approved and 4 were paid after multiple appeals ([about 30%] source: Aug 2 2017 Fatdisorders.org presentation on reimbursement).
There are currently (FEB 2020) "Bad Faith / breach of contract" suits in California against about a half-dozen insurance companies on behalf of patients with lipedema who were denied coverage for reconstructive, tumescent, lymph-sparing liposuction. It is expected that most will change their policies as a result and reimburse based on the reconstructive surgery conditions listed above.