1. Home
  2. ICD-10-CM Codes
  3. L00–L99
  4. L60-L75
  5. L66
  6. 2024 ICD-10-CM Code L66
Version 2024
Non-Billable Code

2024 ICD-10-CM Diagnosis Code L66

Cicatricial alopecia [scarring hair loss]

ICD-10-CM Code:
L66
ICD-10 Code for:
Cicatricial alopecia [scarring hair loss]
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Diseases of the skin and subcutaneous tissue
    (L00–L99)
    • Disorders of skin appendages
      (L60-L75)
      • Cicatricial alopecia [scarring hair loss]
        (L66)

L66 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of cicatricial alopecia [scarring hair loss]. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Cicatricial alopecia [scarring hair loss]

Non-specific codes like L66 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for cicatricial alopecia [scarring hair loss]:

  • Use L66.0 for Pseudopelade - BILLABLE CODE

  • Use L66.1 for Lichen planopilaris - BILLABLE CODE

  • Use L66.2 for Folliculitis decalvans - BILLABLE CODE

  • Use L66.3 for Perifolliculitis capitis abscedens - BILLABLE CODE

  • Use L66.4 for Folliculitis ulerythematosa reticulata - BILLABLE CODE

  • Use L66.8 for Other cicatricial alopecia - BILLABLE CODE

  • Use L66.9 for Cicatricial alopecia, unspecified - BILLABLE CODE

Patient Education


Hair Loss

You lose up to 100 hairs from your scalp every day. That's normal, and in most people, those hairs grow back. But many men -- and some women -- lose hair as they grow older. You can also lose your hair if you have certain diseases, such as thyroid problems, diabetes, or lupus. If you take certain medicines or have chemotherapy for cancer, you may also lose your hair. Other causes are stress, a low protein diet, a family history, or poor nutrition.

Treatment for hair loss depends on the cause. In some cases, treating the underlying cause will correct the problem. Other treatments include medicines and hair restoration.


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.