ICD-10 Code A52.9 – Late syphilis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A52.9 – Late syphilis, unspecified
What it is
A52.9 identifies late syphilis when the stage is documented as late but no specific late manifestation is named. Use it for a confirmed history of syphilis with current late disease, not for screening or suspected exposure.
Clinical signs
Clinical features vary; refer to documentation. Late syphilis may involve neurologic, cardiovascular, or other tertiary findings, but this code is used only when the record does not specify the exact late form.
When to use this code
Use A52.9 when the provider documents late syphilis, tertiary syphilis, or another late stage without further detail. It also fits when the chart confirms late syphilis but does not identify neurosyphilis, cardiovascular syphilis, or another specific subtype.
If the note gives a more precise late manifestation, code that condition instead of this unspecified category. Check documentation for staging, because earlier syphilis or congenital syphilis requires different codes.
Do not use for
Do not use this code for primary, secondary, or latent syphilis, or for congenital infection. Do not use it when a specific late complication is documented and a more exact code is available.
Coding tip
When “late syphilis” appears without a named manifestation, A52.9 is usually the correct fallback after you verify the stage.