In California, if it looks abnormal (subjective), it is supposed to be covered.
“Reconstructive surgery” means surgery performed to correct or repair abnormal structures of the body caused by congenital defects, developmental abnormalities, trauma, infection, tumors, or disease to do either of the following:
(A) To improve function.
(B) To create a normal appearance, to the extent possible.
leginfo.legislature.ca.gov
However, it appears HealthNet (who I won my case against) has rewritten their reconstructive surgery policy to explicitly ATTEMPT to exclude skin removal - but that should not apply to post-bariatric surgery skin removal.
