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I am confused about a denial we received. The patient was seen for knee pain and requested a mammogram. We billed CPT code 99214, but the provider ordered labs and used the diagnosis code Z01.411. The insurance company states that this diagnosis should only be used as a primary or sole diagnosis. However, if we bill it as the primary diagnosis, we need to use a preventative CPT code. The patient was not seen for a preventative visit. What should I do?