Your primary dx should be the sign/symptom or diagnosis that drove the encounter. This may or may not be the presenting problem. (ie pt presents with pharyngitis, but due to pain has not been drinking fluids. Labs indicate dehydration, for which an IV of fluids is started and he/she is admitted overnight.
Neurosyphilis is considered infectious but is not transmitted from person to person. Generally, a disease like this is caused by an infectious agent and not spread between people. Neurosyphilis, although infectious, is not a genetic disease. It is not caused by a defective or abnormal gene.
How to Tell when You Are Contagious. Four Parts: Identifying the Symptoms of a Contagious Illnesses Putting the Symptoms Together Preventing the Spread of Contagious Illnesses Watching Out for Other Contagious Illnesses Community Q&A. Being contagious means that you are capable of transmitting an illness to another person.