ICD-10 Code A65 – Nonvenereal syphilis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A65 – Nonvenereal syphilis
What it is
A65 identifies nonvenereal syphilis, a treponemal infection acquired without sexual transmission. Use it when the record specifically documents a nonvenereal form of syphilis.
Clinical signs
Clinical features vary; refer to documentation. Findings may include skin, mucosal, or skeletal involvement consistent with a treponemal infection, but the exact presentation depends on the documented stage and site.
When to use this code
Use A65 when the provider clearly documents nonvenereal syphilis or a related nonsexual treponemal infection. This code fits cases where the chart distinguishes the condition from sexually transmitted syphilis. If the record is vague, check documentation before assigning the code.
Do not use for
Do not use A65 for syphilis acquired through sexual contact or when the diagnosis is unspecified. If the note describes another treponemal disease or a congenital infection, select the more accurate code.
Coding tip
Code A65 only when the nonvenereal route is documented; otherwise, verify the provider’s wording before coding.