2020 ICD-10-CM Diagnosis Code L43.9

Lichen planus, unspecified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • L43.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM L43.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of L43.9 - other international versions of ICD-10 L43.9 may differ.
The following code(s) above L43.9 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 L43.9:
  • L00-L99
    2020 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
  • L43
    ICD-10-CM Diagnosis Code L43

    Lichen planus

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • lichen planopilaris (L66.1)
    Lichen planus
Approximate Synonyms
  • Lichen planus
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.
ICD-10-CM L43.9 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 606 Minor skin disorders with mcc
  • 607 Minor skin disorders without mcc

Convert L43.9 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

Diagnosis Index entries containing back-references to L43.9:
  • Lichen L28.0
    ICD-10-CM Diagnosis Code L28.0

    Lichen simplex chronicus

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Circumscribed neurodermatitis
    • Lichen NOS
    • planus (chronicus) L43.9
      • of Wilson L43.9
    • ruber
      • planus L43.9
  • Wilson's
    • lichen ruber L43.9

ICD-10-CM Codes Adjacent To L43.9
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
L44.3 Lichen ruber moniliformis
L44.4 Infantile papular acrodermatitis [Gianotti-Crosti]
L44.8 Other specified papulosquamous disorders
L44.9 Papulosquamous disorder, unspecified
L45 Papulosquamous disorders in diseases classified elsewhere
L49 Exfoliation due to erythematous conditions according to extent of body surface involved

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