2019 ICD-10-CM Diagnosis Code L51.9

Erythema multiforme, unspecified

    2016 2017 2018 2019 Billable/Specific Code
  • L51.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM L51.9 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of L51.9 - other international versions of ICD-10 L51.9 may differ.
Applicable To
  • Erythema iris
  • Erythema multiforme major NOS
  • Erythema multiforme minor NOS
  • Herpes iris
The following code(s) above L51.9 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 L51.9:
  • L00-L99
    2019 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
  • L49-L54
    2019 ICD-10-CM Range L49-L54

    Urticaria and erythema

    Type 1 Excludes
    Urticaria and erythema
  • L51
    ICD-10-CM Diagnosis Code L51

    Erythema multiforme

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • staphylococcal scalded skin syndrome (L00)
    • Ritter's disease (L00)
    Use Additional
    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
    Erythema multiforme
Approximate Synonyms
  • Erythema multiforme
  • Erythema multiforme minor
Clinical Information
  • A disorder characterized by target lesions (a pink-red ring around a pale center).
  • A hypersensitivity reaction characterized by the sudden appearance of symmetrical cutaneous and mucocutaneous macular or popular lesions which evolve into lesions with bright red borders (target lesions). The lesions usually appear in the hands, feet, extremities, and face. Symptoms include fever, malaise, sore throat, cough, vomiting, diarrhea, arthalgia, and myalgia. Causes include infections (most commonly herpes simplex virus), drugs (e.g., sulfonamides, anticonvulsants, and antibiotics), malignancies, and collagen vascular disorders.
  • A skin and mucous membrane disease characterized by an eruption of macules, papules, nodules, vesicles, and/or bullae with characteristic "bull's-eye" lesions usually occurring on the dorsal aspect of the hands and forearms.
  • Self-limiting form of erythema multiforme.
  • Skin and mucous membrane disease characterized by an eruption of macules, papules, nodules, vesicles, and/or bullae with characteristic bull's-eye lesions usually occurring on the dorsal aspect of the hands and forearms.
ICD-10-CM L51.9 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 595 Major skin disorders with mcc
  • 596 Major skin disorders without mcc

Convert L51.9 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

Diagnosis Index entries containing back-references to L51.9:
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) M19.90
    ICD-10-CM Diagnosis Code M19.90

    Unspecified osteoarthritis, unspecified site

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Arthrosis NOS
    • Arthritis NOS
    • Osteoarthritis NOS
    • in (due to)
      • erythema
        • multiforme L51.9 - see also subcategory M14.8-
  • Arthropathy M12.9
    - see also Arthritis
    ICD-10-CM Diagnosis Code M12.9

    Arthropathy, unspecified

      2016 2017 2018 2019 Billable/Specific Code
  • Erythema, erythematous (infectional) (inflammation) L53.9
    ICD-10-CM Diagnosis Code L53.9

    Erythematous condition, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Erythema NOS
    • Erythroderma NOS
  • Herpes, herpesvirus, herpetic B00.9
    ICD-10-CM Diagnosis Code B00.9

    Herpesviral infection, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Herpes simplex infection NOS
    • iris L51.9 (vesicular erythema multiforme)

ICD-10-CM Codes Adjacent To L51.9
L50.5 Cholinergic urticaria
L50.6 Contact urticaria
L50.8 Other urticaria
L50.9 Urticaria, unspecified
L51 Erythema multiforme
L51.0 Nonbullous erythema multiforme
L51.1 Stevens-Johnson syndrome
L51.2 Toxic epidermal necrolysis [Lyell]
L51.3 Stevens-Johnson syndrome-toxic epidermal necrolysis overlap syndrome
L51.8 Other erythema multiforme
L51.9 Erythema multiforme, unspecified
L52 Erythema nodosum
L53 Other erythematous conditions
L53.0 Toxic erythema
L53.1 Erythema annulare centrifugum
L53.2 Erythema marginatum
L53.3 Other chronic figurate erythema
L53.8 Other specified erythematous conditions
L53.9 Erythematous condition, unspecified
L54 Erythema in diseases classified elsewhere
L55 Sunburn

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