ICD-10-CM diagnosis code
A51.5 Early syphilis, latent
- Billable
- Yes, a complete code (FY2026)
- Category
- A51 Early syphilis
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Other codes in A51
15 complete codes in this category.
- A51.31Condyloma latum
- A51.32Syphilitic alopecia
- A51.39Other secondary syphilis of skin
- A51.41Secondary syphilitic meningitis
- A51.42Secondary syphilitic female pelvic disease
- A51.43Secondary syphilitic oculopathy
- A51.44Secondary syphilitic nephritis
- A51.45Secondary syphilitic hepatitis
- A51.46Secondary syphilitic osteopathy
- A51.49Other secondary syphilitic conditions
- A51.5Early syphilis, latent
- A51.9Early syphilis, unspecified
Documentation tips
- Make sure the note supports every element of the title, “Early syphilis, latent”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to A51.
The international WHO ICD-10 also has A51.5, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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