Lichen planus (L43) ICD-10-CM
The L43 code range covers lichen planus with 7 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- lichen planopilaris L66.1
Codes in the L43 Range 7 codes · 6 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the L43 range.
Bullous Lichen Planus
A rare form of lichen planus that is characterized by the formation of vesico-bullous lesions on top of preexisting lichen planus papules or on normal skin.
Hypertrophic Lichen Planus
A form of lichen planus that is characterized by plaques of markedly thickened skin that is often extremely pruritic and localized to the lower legs. It can result in permanent pigmentation and scarring.
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.
About the L43 Code Range
Lichen planus is an itchy, inflammatory condition of the skin and moist body linings. It causes purplish, flat-topped bumps.
The subdivisions distinguish thickened (L43.0) and blistering (L43.1) forms. They also identify a lichenoid drug reaction (L43.2) and subacute, active lichen planus (L43.3). L43.8 identifies other lichen planus, while L43.9 leaves the form unspecified.
Questions About This Page
How many billable codes are in the L43 range?
Of the 7 codes in this range, 6 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the L43 range classify?
The range classifies lichen planus. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
