2024 ICD-10-CM Diagnosis Code C4A.1

by

Merkel cell carcinoma of eyelid, including canthus

  • C4A.1 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2024 edition of ICD-10-CM C4A.1 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of C4A.1 – other international versions of ICD-10 C4A.1 may differ.

The following code(s) above C4A.1 contain annotation back-references

 that may be applicable to C4A.1:

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

Diagnosis Index entries containing back-references to C4A.1: