The state Labor Commissioner can prosecute an employer for failing to pay wages, but not health care benefits. This leaves you with the only option being hiring a lawyer and filing suit for the employer's breach of contract, as provided for in your employee handbook.
If you can show that the benefits denied are discriminatory, e.g., based upon your sex (likelihood of pregnancy, etc.), then you could force the employer to maintain your employment. If not, then you could lose your job, because there would be nothing to stop the employer from terminating you.
Also, unless the amount of your damages are sizable, the cost of hiring a lawyer, could overwhelm your recovery. So, while you may have a valid claim, the risks associated with suing could put your job (and your wallet) at some considerable risk.
If you want to pursue this further, then for an employment rights attorney referral, see this link.
Please understand that I "justanswer" questions “about” the law. I have no interest in providing you with anything less than a completely satisfying answer. However, if the law does not favor your unique circumstances, then the best that I can do is to explain what the law "is" and what it "is not."
Hope this helps.
NOTICE: My goal here is to educate others about the law. I am always available to answer your follow-up questions after you click Accept – however, if you do not click Accept, the website gets paid, and I receive nothing. This is true, even if you are on a subscription plan. So please click Accept, so that I will be able to continue to provide this service for others in the future.
And, if you need to contact me again, please put my user id on the title line of your question (“To Socrateaser”), and the system will send me an alert. Thanks!