HSA contribution is indicated in box 12 of W2 with code W (employer+employee) is added as income to CALIFORNIA state tax.

[dmertz]

That's correct.  California does not conform to the federal treatment of HSA contributions and does not permit this amount to be excluded from your income, so it must be added back.

[Robert777]

In the CA state return turbotax's Learn More for W2 box 12 code W for California's for says: 

"If your employer contributed money to an HSA on your behalf, that contribution is not taxed by the federal government. However, California considers it taxable income."

However, w2 box 12 code W includes my contribution as well as my employer's.  Does CA not consider employee contributions to an HSA as pre-tax contributions and therefore tax my contributions as well as my employer's?