2024 ICD-10-CM Diagnosis Code A51.5

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Early syphilis, latent

  • A51.5 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2024 edition of ICD-10-CM A51.5 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of A51.5 – other international versions of ICD-10 A51.5 may differ.

Applicable To

  • Syphilis (acquired) without clinical manifestations, with positive serological reaction and negative spinal fluid test, less than two years after infection.

The following code(s) above A51.5 contain annotation back-references

 that may be applicable to A51.5:

  • A00-B99  Certain infectious and parasitic diseases
  • A50-A64  Infections with a predominantly sexual mode of transmission

Approximate Synonyms

  • Latent early syphilis
  • Serological relapse after treatment of latent early syphilis
  • Syphilis
  • Syphilis, latent, early

ICD-10-CM A51.5 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

  • 867 Other infectious and parasitic diseases diagnoses with mcc
  • 868 Other infectious and parasitic diseases diagnoses with cc
  • 869 Other infectious and parasitic diseases diagnoses without cc/mcc

Convert A51.5 to ICD-9-CMCode History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change

Diagnosis Index entries containing back-references to A51.5:

  • Syphilis, syphilitic (acquired) A53.9
    • earlyA51.9
      • latent (without manifestations) (less than 2 years after infection) A51.5
        • negative spinal fluid test A51.5
        • serological relapse after treatment A51.5
        • serology positive A51.5
    • latentA53.0
      • positive serology (only finding) A53.0
        • early, or less than 2 years after infection A51.5
      • early, or less than 2 years after infection A51.5