ICD-10-CM 2027 diagnosis code

L43Lichen planus

Not billable — use a more specific code

L43 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About L43

L43 is the ICD-10-CM diagnosis code for lichen planus. It belongs to block L40-L45 (papulosquamous disorders) and chapter 12 (diseases of the skin and subcutaneous tissue). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: L43.0 (planus), L43.1 (planus), L43.2 (reaction), L43.3 (planus), L43.8 (planus) and L43.9 (unspecified).

Don't report L43 together with the conditions in its Excludes1 note: lichen planopilaris (L66.1-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under L43

Coding notes

Excludes1Not coded here — never report together with this code

lichen planopilaris (L66.1-)

Notes that apply from higher levels

Instructions written at a parent level also apply to L43.

Broader instructions also apply from Chapter 12: Diseases of the skin and subcutaneous tissue.

Code history

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2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about L43

Is L43 billable?: No. L43 is a header code. Report one of its more specific subcodes instead.