Box 12b Code W - HSA contributions. How is it calculated?

I just received my W2 form today from my employer and I suspect there might be a mistake on how the Box 12b Code W was calculated.

"W—Employer contributions (including amounts the employee elected to contribute using a section 125 (cafeteria) plan) to your health savings account. Report on Form 8889, Health Savings Accounts (HSAs)."

 

From the IRS instructions, this box should include the contributions made to my HSA account by me and by my employer, however my employer is also adding the amount deducted for the Medical Plan premium. This amount is deducted by them to pay for my Medical insurance policy and it is not deposited to my HSA account.

 

Is this calculation correct?