2025 ICD-10-CM Diagnosis Code L66.1

by

Lichen planopilaris

  • L66.1 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • ICD-10-CM L66.1 is a new 2025 ICD-10-CM code that became effective on October 1, 2024.
  • This is the American ICD-10-CM version of L66.1 – other international versions of ICD-10 L66.1 may differ.

The following code(s) above L66.1 contain annotation back-references

 that may be applicable to L66.1:

  • L00-L99  Diseases of the skin and subcutaneous tissue
  • L60-L75  Disorders of skin appendages

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

Code annotations containing back-references to L66.1:

  • Type 1 Excludes: L43
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