ICD-10 Code A51.32 – Syphilitic alopecia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A51.32 – Syphilitic alopecia
What it is
A51.32 identifies hair loss caused by syphilis, typically in the secondary stage. Use it when documentation specifically links alopecia to syphilitic infection.
Clinical signs
Clinical features vary; refer to documentation. Reported findings include patchy, diffuse, or “moth-eaten” hair loss, sometimes involving scalp, eyebrows, or beard.
When to use this code
Use this code when the provider documents syphilitic alopecia or hair loss attributed to syphilis. It may appear with other secondary syphilis manifestations, but the record should clearly connect the alopecia to the infection. If the cause is unclear, check documentation.
Do not use for
Do not use it for nonspecific hair loss, alopecia areata, traction alopecia, or hair loss from other infections. If syphilis is not documented as the cause, choose a different code.
Coding tip
Code the syphilis manifestation only when the chart explicitly states syphilitic alopecia.