2020 ICD-10-CM Diagnosis Code L42

Pityriasis rosea

    2016 2017 2018 2019 2020 Billable/Specific Code
  • L42 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 L42 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of L42 - other international versions of ICD-10 L42 may differ.
The following code(s) above L42 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 L42:
  • 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
Clinical Information
  • A mild exanthematous inflammation of unknown etiology. It is characterized by the presence of salmon-colored maculopapular lesions. The most striking feature is the arrangement of the lesions such that the long axis is parallel to the lines of cleavage. The eruptions are usually generalized, affecting chiefly the trunk, and the course is often self-limiting.
ICD-10-CM L42 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 606 Minor skin disorders with mcc
  • 607 Minor skin disorders without mcc

Convert L42 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 L42:
  • Disease, diseased - see also Syndrome
  • Gibert's disease or pityriasis L42
  • Pityriasis (capitis) L21.0
    ICD-10-CM Diagnosis Code L21.0

    Seborrhea capitis

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Cradle cap
    • circinata L42 (et maculata)
    • rosea L42

ICD-10-CM Codes Adjacent To L42
L40.8 Other psoriasis
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

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