A51.4
Other secondary syphilis
A51.4 is a non-billable ICD-10-CM code header for other secondary syphilis. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are A51.41 Secondary syphilitic meningitis, A51.42 Secondary syphilitic female pelvic disease, A51.43 Secondary syphilitic oculopathy, A51.44 Secondary syphilitic nephritis and 3 more. Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 6 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (6 notes)
- human immunodeficiency virus [HIV] disease (B20)
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- diseases generally recognized as communicable or transmissible
More specific codes under A51.4 7
- A51.41Secondary syphilitic meningitisBillable
- A51.42Secondary syphilitic female pelvic diseaseBillable
- A51.43Secondary syphilitic oculopathyBillable
- A51.44Secondary syphilitic nephritisBillable
- A51.45Secondary syphilitic hepatitisBillable
- A51.46Secondary syphilitic osteopathyBillable
- A51.49Other secondary syphilitic conditionsBillable