We got a denial from our billing company for a medicare claim for 96116. We received a "Message 16" whatever that is. Then further on it says MA130 - basically incomplete and/or invalid information. Our billing company is saying that we need a referring provider (our billing company has made mistakes in the past). I thought that was only required for consultations (E&M codes). Can anyone point me in the direction of where it says a referring provider is required or what a message 16 is?