siliconmary,
This is not what you want to hear, but the insurance co can deny the claim based on timely filing limits. And, unfortunately, it is the ultimate responsibility of the insured to ensure that all claims are timely filed, not the physician. Most people depend on their practitioners to file claims. That is the norm. However, again, the liability for the costs remains the burden of the insured. The health plan offers reimbursement for eligible services when the terms of the plan are followed, including timely filing limits.
But, now, what to do. Read and follow the terms of the health plan's appeal process. It is not impossible for the plan to make exceptions (but realize there may not be an incentive for them to do so.) Also, talk to your physician. Ask the physician to refile the claims on your behalf with an appeal explaining if there was a reason for them to not be filed earlier. I have known (although not the norm) facilities and / or practitioners to write off fees when their mistake is obvious.) If these channels do not work, then, seek the advice of a professional. Just one tidbit, there are regulations concerning breast reconstructive surgery. This is an area that public opinion and even the law recognizes as a right for affected women. Rattling cages just might obtain the result you need.
(Also, re the ins co telling the physician she cannot collect: to the best of my knowledege that is erroneous, and I suspect they are trying to pressure the physician into writing off the charges. However, there may be particulars regarding the type of plan and who regulates, ie federal or state, of which I am unaware.)
I hope the best for you.
lkc15507