2027 ICD-10-CM Diagnosis Code L43.9Lichen planus, unspecified
ICD-10-CM Codes›L00–L99›L40-L45›L43
- Billable — Valid for Submission
- Not Chronic
L43.9 is a billable ICD-10-CM diagnosis code for lichen planus, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Conjunctivitis associated with autoimmune skin disorder
- Conjunctivitis due to lichen planus
- Dermatosis of scalp
- Eruption of female perineum
- Eruption of skin of penis
- Eruption of vulva
- Genital lichen planus
- Gingivostomatitis
- Guttate lichen planus
- Hyperkeratosis of vulva
- Hyperplasia of gingiva
- Inflammation of vaginal wall
- Lichen planus
- Lichen planus co-occurrent with onycholysis
- Lichen planus of gingiva
- Lichen planus of glans penis
- Lichen planus of lips
- Lichen planus of nail
- Lichen planus of palms and soles
- Lichen planus of penis
- Lichen planus of scalp
- Lichen planus of tongue
- Lichen planus of vulva
- Lichen planus-lupus erythematosus overlap
- Lichenification of female perineum
- Lichenification of vulva
- Linear lichen planus
- Lupus erythematosus overlap syndrome
- Nail pterygium in lichen planus
- Onychoatrophy
- Onychoatrophy due to lichen planus
- Onycholysis
- Oral lichen planus
- Overlap syndrome
- Papular oral lichen planus
- Perianal dermatitis
- Perianal lichen planus
- Poikiloderma due to lichen planus
- Post-inflammatory hyperpigmentation
- Post-inflammatory hyperpigmentation in lichen planus
- Postinflammatory skin pigmentation change
- Pterygium of nail
- Rash of scalp
- Site-specific lichen planus
- Vulvovaginal gingival syndrome
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L43.9: its own notes plus those printed at L43 and Chapter 12. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- 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.-)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
lichen ruber L43.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Lichen Planus
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.
Patient EducationClinical
Skin Conditions
Your skin is your body's largest organ. It covers the entire outside of your body. There are many ways that your skin protects your body and helps keep you healthy. For example, it:
The full article covers:
- What does your skin do?
- What problems and conditions can affect your skin?
- How can I keep my skin healthy?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert L43.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L43.9Overview
What is the ICD-10 code for lichen planus, unspecified?
The ICD-10-CM code for lichen planus, unspecified is L43.9 (sometimes written as L439). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is L43.9 (Lichen planus) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report lichen planus, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L43.9 group to?
When lichen planus, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 607, 606, with relative weights from 0.8772 to 1.5721 depending on complications. Higher weights mean higher Medicare reimbursement.
Can L43.9 be reported with a code from L66.1?
Not as a rule. The Excludes1 note at L43, which applies to L43.9, lists "lichen planopilaris (L66.1-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of L43.9?
Under the General Equivalence Mappings, lichen planus, unspecified converts to ICD-9-CM 697.0 (lichen planus). The mapping is approximate, so confirm the match fits the documentation.
