Is L66.1 a billable ICD-10-CM code?

No. L66.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does L66.1 sit in the tabular list?

Diseases of the skin and subcutaneous tissue (L00-L99), in the block Disorders of skin appendages (L60-L75).

L66.1

L66.1 — Lichen planopilaris

Non-billable headerICD-10-CM

L66.1 is a non-billable header ICD-10-CM code for lichen planopilaris. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with L66.1

These codes carry an Excludes1 note pointing at L66.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading L66.1 alone.

L43Lichen planus

Risk adjustment

L66.1 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.

Code to one of these instead L66.1

4 child codes. Green means billable.

Related codes at this level

Codes that share L66. If L66.1 is not quite right, the correct code is usually one of these.

Questions about L66.1

Is L66.1 a billable ICD-10-CM code?: No. L66.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does L66.1 sit in the tabular list?: Diseases of the skin and subcutaneous tissue (L00-L99), in the block Disorders of skin appendages (L60-L75).