Are you a (certified) coder? Your original post says you were hired as an accounting clerk and thrown into the billing. The reason I ask is because you said that it is charted with the Z00.01 but it's coded as a medical E&M so I'm wondering if the provider is leaving it off because the visit was for the medical reasons and really wasn't a routine check at all. Some times patients schedule a "check up" but it's really a medical check up. The routine dx is there, but not really appropriate for the visit. Only the provider would be able to tell that, or a certified coder that is reviewing the notes. So I'm wondering what is making you concerned. Maybe a little more info?