Primary anal syphilis

This code signifies the initial stage of syphilis affecting the anal region. It typically presents as a chancre, a painless ulcer, on or around the anus, which is the primary lesion of the infection. This stage is highly infectious and can be accompanied by regional lymphadenopathy.

Use this code when documentation clearly indicates a primary syphilitic lesion located in the anal canal or perianal area. This diagnosis is often confirmed by serological tests for syphilis (e.g., RPR, VDRL, FTA-ABS) and/or direct visualization of spirochetes from the chancre.

• Differentiate from secondary syphilis manifestations, which involve systemic symptoms and widespread rash.
• Ensure documentation specifies "primary" stage and "anal" location to avoid confusion with other syphilis codes.
• Consider co-occurring sexually transmitted infections (STIs) and code them appropriately.