Not sure, since the original poster didn't specify if they were billing for both services in the same instance. IF you were billing them together that might be the issue or it might be diagnosis related?
My office will typically bill 92136 with a cataract diagnosis for the first eye and then at a point in the future when the patient returns for the second eye we will then bill the second as 92136 - 26 with the LT or RT modifier, again with the cataract diagnosis for the operative eye.