If you are already covered by this plan then details for your specific plan must be available on the insurance company website, to make sure you are seeing the correct information you should only be looking at documents that you can see after you have logged into the website.
The plan documents should also include examples explain how the different limits apply.
For your specific claim there will be an EOB (Explanation of Benefit) that will walk you though how the charges for the different services on that claim are covered by your policy. It will also take into account the network status of the provider; the category of the service; and how your deductible, co-pay and co-insurance rules apply to that specific claim.
If the EOB doesn't answer your question, call the toll-free number to ask questions. There is also a chance that something was miss-coded.
It is possible that the policy documents are also on your employers website, but I found that if there were multiple choices involved, the most accurate and relevant set of documents is on the insurance company website linked to my account.