Is L43.9 a billable ICD-10-CM code?

Yes. L43.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does L43.9 sit in the tabular list?

Diseases of the skin and subcutaneous tissue (L00-L99), in the block Papulosquamous disorders (L40-L45).

What cannot be coded together with L43.9?

L43.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above L43.9 (L43) and apply to it just the same.

L43.9

L43.9 — Lichen planus, unspecified

Billable / specific codeICD-10-CM

L43.9 is a billable, specific ICD-10-CM code for lichen planus, unspecified. It is valid for submission on a claim.

Excludes1 inherited from the categories above L43.9

These are not written on L43.9, but they bind it: a note on a category applies to every code beneath it. Billing L43.9 with anything listed here is a denial.

Written on L43 — Lichen planus

lichen planopilaris (L66.1-)

Risk adjustment

L43.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

How L43.9 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to L43.9.

Lichen›planus(chronicus)
Wilson's›lichen ruber
Lichen›planus›of Wilson
Lichen›ruber›planus

Code history

L43.9 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share L43. If L43.9 is not quite right, the correct code is usually one of these.

Questions about L43.9

Is L43.9 a billable ICD-10-CM code?: Yes. L43.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does L43.9 sit in the tabular list?: Diseases of the skin and subcutaneous tissue (L00-L99), in the block Papulosquamous disorders (L40-L45).
What cannot be coded together with L43.9?: L43.9 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above L43.9 (L43) and apply to it just the same.