ICD-10 Code A51.42 – Secondary syphilitic female pelvic disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A51.42 – Secondary syphilitic female pelvic disease
What it is
This code identifies pelvic disease in a female patient caused by secondary syphilis. Use it when documentation links pelvic involvement to active secondary syphilis.
Clinical signs
Clinical features vary; refer to documentation. Secondary syphilis may include mucocutaneous lesions, rash, lymphadenopathy, and other systemic findings, with pelvic disease noted as part of the infection.
When to use this code
Use A51.42 when the provider documents secondary syphilis affecting the female pelvis, such as pelvic inflammatory involvement attributed to the infection. Code it only when the record clearly supports secondary-stage syphilis rather than another syphilis stage or unrelated pelvic disorder.
Do not use for
Do not use this code for congenital syphilis, latent syphilis, or tertiary syphilis. Do not assign it when pelvic symptoms are present but syphilis is not documented as the cause.
Coding tip
Confirm both the syphilis stage and the female pelvic involvement in the chart before assigning A51.42.