ICD-10-CM Codes
L00-L99
L60-L75
L66-
2023 ICD-10-CM Diagnosis Code L66.1

2023 ICD-10-CM Diagnosis Code L66.1

Lichen planopilaris

2016

2017

2018

2019

2020

2021

2022

2023

Billable/Specific Code

L66.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
The 2023 edition of ICD-10-CM L66.1 became effective on October 1, 2022.
This is the American ICD-10-CM version of L66.1 - other international versions of ICD-10 L66.1 may differ.

Applicable To

Follicular lichen planus

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

Annotation Back-References

In this context, annotation back-references refer to codes that contain:

Applicable To annotations, or
Code Also annotations, or
Code First annotations, or
Excludes1 annotations, or
Excludes2 annotations, or
Includes annotations, or
Note annotations, or
Use Additional annotations

that may be applicable to L66.1:

L00-L99
2023 ICD-10-CM Range L00-L99
Diseases of the skin and subcutaneous tissue
Type 2 Excludes
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- lipomelanotic reticulosis (I89.8)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- viral warts (B07.-)
Diseases of the skin and subcutaneous tissue
L60-L75
2023 ICD-10-CM Range L60-L75
Disorders of skin appendages
Type 1 Excludes
- congenital malformations of integument (Q84.-)
Disorders of skin appendages

ICD-10-CM L66.1 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):

606 Minor skin disorders with mcc
607 Minor skin disorders without mcc

Convert L66.1 to ICD-9-CM

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

Code annotations containing back-references to L66.1:

Type 1 Excludes: L43

ICD-10-CM Diagnosis Code L43
Lichen planus
Type 1 Excludes
- lichen planopilaris (L66.1)

Diagnosis Index entries containing back-references to L66.1:

Lichen L28.0
ICD-10-CM Diagnosis Code L28.0
Lichen simplex chronicus
Applicable To
Circumscribed neurodermatitis
Lichen NOS
- planus (chronicus) L43.9
  ICD-10-CM Diagnosis Code L43.9
  Lichen planus, unspecified
  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  - follicular L66.1
- planopilaris L66.1

ICD-10-CM Codes Adjacent To L66.1

L64.8 Other androgenic alopecia

L64.9 Androgenic alopecia, unspecified

L65 Other nonscarring hair loss

L65.0 Telogen effluvium

L65.1 Anagen effluvium

L65.2 Alopecia mucinosa

L65.8 Other specified nonscarring hair loss

L65.9 Nonscarring hair loss, unspecified

L66 Cicatricial alopecia [scarring hair loss]

L66.0 Pseudopelade

L66.1 Lichen planopilaris

L66.2 Folliculitis decalvans

L66.3 Perifolliculitis capitis abscedens

L66.4 Folliculitis ulerythematosa reticulata

L66.8 Other cicatricial alopecia

L66.9 Cicatricial alopecia, unspecified

L67 Hair color and hair shaft abnormalities

L67.0 Trichorrhexis nodosa

L67.1 Variations in hair color

L67.8 Other hair color and hair shaft abnormalities

L67.9 Hair color and hair shaft abnormality, unspecified

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

2023 ICD-10-CM Diagnosis Code L66.1

Lichen planopilaris

Diseases of the skin and subcutaneous tissue

Disorders of skin appendages

Lichen planus

Lichen simplex chronicus

Lichen planus, unspecified