2025 ICD-10-CM Diagnosis Code Q23.8

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Other congenital malformations of aortic and mitral valves

  • Q23.8 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • ICD-10-CM Q23.8 is a new 2025 ICD-10-CM code that became effective on October 1, 2024.
  • This is the American ICD-10-CM version of Q23.8 – other international versions of ICD-10 Q23.8 may differ.

The following code(s) above Q23.8 contain annotation back-references

 that may be applicable to Q23.8:

  • Q00-Q99  Congenital malformations, deformations and chromosomal abnormalities

Approximate Synonyms

  • Cleft leaflet of mitral valve
  • Congenital (at birth) cleft leaflet of mitral valve
  • Congenital mitral valve cleft leaflet (at birth)

Code 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
  • 2025 (effective 10/1/2024): Deleted code
  • 2025 (effective 10/1/2024): New code
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