2024 ICD-10-CM Diagnosis Code A50.42

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Late congenital syphilitic encephalitis

  • A50.42 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 A50.42 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of A50.42 – other international versions of ICD-10 A50.42 may differ.

The following code(s) above A50.42 contain annotation back-references

 that may be applicable to A50.42:

  • A00-B99  Certain infectious and parasitic diseases
  • A50-A64  Infections with a predominantly sexual mode of transmission
  • A50.4  Late congenital neurosyphilis [juvenile neurosyphilis]

Approximate Synonyms

  • Congenital syphilitic encephalitis

ICD-10-CM A50.42 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

  • 097 Non-bacterial infection of nervous system except viral meningitis with mcc
  • 098 Non-bacterial infection of nervous system except viral meningitis with cc
  • 099 Non-bacterial infection of nervous system except viral meningitis without cc/mcc

Convert A50.42 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 A50.42: