private health cover and tax credits

hi

As of the start of this yr i have been provided with family health cover through work.its being treated as a medical benefit in my payslip and added to my taxable income.my tax code has not changed so i will not receive a p11d.do i have to declare this as income as it shows as gross pay on my p60?the benefit is valued at ~£100 per month so i want to make sure its treated correctly!

thanks in advance