ICD-10 · PDGM grouping
L66 Cicatricial alopecia [scarring hair loss]
All 11 codes in the L66 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
11
Can lead a claim
11
Cannot lead a claim
0
What CMS assigns to L66
All 11 codes group to MMTA - Other (10) and MMTA - Gastrointestinal tract and Genitourinary system (1). None of the 11 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in L66
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| L66.0 | Pseudopelade | Can lead a claim | A | None |
| L66.1 Lichen planopilaris | ||||
| L66.10 | Lichen planopilaris, unspecified | Can lead a claim | J | None |
| L66.11 | Classic lichen planopilaris | Can lead a claim | A | None |
| L66.12 | Frontal fibrosing alopecia | Can lead a claim | A | None |
| L66.19 | Other lichen planopilaris | Can lead a claim | A | None |
| L66.2 | Folliculitis decalvans | Can lead a claim | A | None |
| L66.3 | Perifolliculitis capitis abscedens | Can lead a claim | A | None |
| L66.4 | Folliculitis ulerythematosa reticulata | Can lead a claim | A | None |
| L66.8 Other cicatricial alopecia | ||||
| L66.81 | Central centrifugal cicatricial alopecia | Can lead a claim | A | None |
| L66.89 | Other cicatricial alopecia | Can lead a claim | A | None |
| L66.9 | Cicatricial alopecia, unspecified | Can lead a claim | A | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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