Other primary syphilis

This code signifies the initial stage of syphilis infection, characterized by the presence of a chancre (a painless ulcer) at the site of bacterial entry, typically on the genitals, anus, or mouth. It represents the earliest manifestation of the disease before systemic dissemination.

Apply this code when documentation explicitly states a diagnosis of primary syphilis, particularly when the characteristic chancre is present. This code is appropriate for cases where the infection is localized and has not yet progressed to secondary or latent stages.

• Differentiate from secondary syphilis (e.g., rash, lymphadenopathy) and latent syphilis, which have distinct ICD-9-CM codes.
• Ensure the documentation clearly specifies "primary" syphilis to avoid miscoding.
• Consider co-occurring sexually transmitted infections (STIs) and code them separately if documented.