ICD-10 Code A50.56 – Late congenital syphilitic osteochondropathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A50.56 – Late congenital syphilitic osteochondropathy
What it is
A50.56 identifies late bone and cartilage damage caused by congenital syphilis. Use it when documentation shows delayed skeletal complications from infection acquired before birth.
Clinical signs
Findings may include chronic bone pain, deformity, or radiographic changes affecting the long bones or joints. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents late congenital syphilitic osteochondropathy, osteochondritis, or similar delayed skeletal involvement linked to congenital syphilis. It is appropriate for confirmed congenital infection with later musculoskeletal sequelae. If the record only says suspected syphilis or nonspecific bone disease, check documentation.
Do not use for
Do not use it for acquired syphilis, isolated congenital syphilis without skeletal involvement, or generic osteochondropathy without a congenital syphilis link. Check documentation.
Coding tip
Code the congenital syphilis manifestation only when the provider clearly connects the bone findings to late congenital infection.