On a diagnostic audit of patient dx with syphilis we found that documentation review revealed the patient had Charcot Arthropathy, most likely due to diabetes, not syphilis (no labs or any indication of syphilis anywhere). The billing department at the provider's opffice indicated that their direction is that Charcot Arthropathy always bills the 713.5 and 0.94 codes together. Our stance is that this should be billed as Diabetes (249 or 250 code as appropriate) and 713.5, without the code for syphilis. Thoughts?