Question: If an asymptomatic patient reports a concern that she might have a sexually transmitted disease and wants to be tested, what diagnosis code can the physician report that describes the situation and indicates medical necessity for the test? Texas Subscriber Answer: If the patient has been exposed to someone with a known disease, you should code the diagnosis as V01.6 (Contact with or exposure to venereal diseases). If the patient has no confirmed exposure, report V74.5 (Special screening examination for bacterial and spirochetal diseases, venereal disease). St. Many payers will cover a lab test such as 86592 (Syphilis test; qualitative [e.g., VDRL, RPR, ART]) based on the V01.6 code, but not V74.5. If the ordering physician reports V74.5 because the patient has no symptoms or complaint of known exposure, he or she should obtain a signed advance beneficiary notice (ABN) indicating that the payer will probably deny payment for the lab test, and the lab will bill the patient directly for the test. Reader Questions and You Be the Coder were prepared with the assistance of R.M. Stainton Jr., MD, president of Doctors'Anatomic Pathology Services in Jonesboro, Ark.; and Laurie Castillo, MA, CPC, CPC-H, CCS-P, member of the National Advisory Board of the American Academy of Professional Coders and president of Physician Coding and Compliance Consulting in Virginia.