Recently Medicare is denying my ua's (81002) stating reason 16 Claim/service lacks information or has submission/billing errors; and N575 Mismatch between the submitted ordering/referring provider name and the ordering/referring provider in our records. N264: Missing/incomplete/invalid ordering provider name. They are paying for the E/M service the same day and I'm using a 59 modifier showing that this was a separate lab procedure. Anyone know why this is happening? Just started this past few weeks.