2021 ICD-10-CM Diagnosis Code L43

Lichen planus

    2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • L43 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2021 edition of ICD-10-CM L43 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of L43 - other international versions of ICD-10 L43 may differ.
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as L43. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • lichen planopilaris (
    ICD-10-CM Diagnosis Code L66.1

    Lichen planopilaris

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Follicular lichen planus
    L66.1
    )
The following code(s) above L43 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 L43:
  • L00-L99
    2021 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
Clinical Information
  • An inflammatory, pruritic disease of the skin and mucous membranes, which can be either generalized or localized. It is characterized by distinctive purplish, flat-topped papules having a predilection for the trunk and flexor surfaces. The lesions may be discrete or coalesce to form plaques. Histologically, there is a "saw-tooth" pattern of epidermal hyperplasia and vacuolar alteration of the basal layer of the epidermis along with an intense upper dermal inflammatory infiltrate composed predominantly of t-cells. Etiology is unknown.
  • Inflammatory, pruritic disease of the skin and mucous membranes, which can be either generalized or localized; characterized by distinctive purplish, flat-topped papules having a predilection for the trunk and flexor surfaces; lesions may be discrete or coalesce to form plaques.
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
ICD-10-CM Codes Adjacent To L43
L40.9 Psoriasis, unspecified
L41 Parapsoriasis
L41.0 Pityriasis lichenoides et varioliformis acuta
L41.1 Pityriasis lichenoides chronica
L41.3 Small plaque parapsoriasis
L41.4 Large plaque parapsoriasis
L41.5 Retiform parapsoriasis
L41.8 Other parapsoriasis
L41.9 Parapsoriasis, unspecified
L42 Pityriasis rosea
L43 Lichen planus
L43.0 Hypertrophic lichen planus
L43.1 Bullous lichen planus
L43.2 Lichenoid drug reaction
L43.3 Subacute (active) lichen planus
L43.8 Other lichen planus
L43.9 Lichen planus, unspecified
L44 Other papulosquamous disorders
L44.0 Pityriasis rubra pilaris
L44.1 Lichen nitidus
L44.2 Lichen striatus

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