L66 — Cicatricial alopecia [scarring hair loss]

Not billable

Is L66 billable?

No — L66 is a non-billable header code. L66 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 11 billable codes beneath L66.

Billable codes under this header

L66 at a glance

Code	L66
Description	Cicatricial alopecia [scarring hair loss]
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Excludes1 — never code together — inherited from L60-L75

The conditions below can never be reported together with L66 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

congenital malformations of integument (Q84.-)

Excludes2 — not included here — inherited from Chapter 12

The conditions below are not part of L66, but a patient may have both at the same time. When documentation supports it, L66 and the excluded code may both 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.-)

What codes fall under L66? (7)

How long has L66 existed?

L66 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.