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  6. 2025 ICD-10-CM Code L66.10

2025 ICD-10-CM Diagnosis Code L66.10

Lichen planopilaris, unspecified

ICD-10-CM Code:
L66.10
ICD-10 Code for:
Lichen planopilaris, unspecified
Is Billable?
Yes - Valid for Submission
Code Navigator:

L66.10 is a billable diagnosis code used to specify a medical diagnosis of lichen planopilaris, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2024 through September 30, 2025.

Unspecified diagnosis codes like L66.10 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Code Classification

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

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Cicatricial alopecia due to lichen planus
  • Eczema of scalp
  • Eruption of female perineum
  • Eruption of vulva
  • Frontal fibrosing alopecia
  • Graham Little Piccardi Lassueur syndrome
  • Lichen planopilaris
  • Lichen planopilaris of vulva
  • Lichen planus of scalp
  • Postmenopausal frontal fibrosing alopecia
  • Rash of scalp

New 2025 ICD-10-CM Code

L66.10 is new to ICD-10-CM code set for the FY 2025, effective October 1, 2024. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2024. This is a new and revised code for the FY 2025 (October 1, 2024 - September 30, 2025).

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Replacement Code

L6610 replaces the following previously assigned ICD-10-CM code(s):

  • L66.1 - Lichen planopilaris

Code History