Seborrheic dermatitis (L21) ICD-10-CM
The L21 code range covers seborrheic dermatitis with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the L21 Range 5 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the L21 range.
Dandruff
Excessive shedding of dry scaly material from the scalp in humans.
Dermatitis, Seborrheic
A chronic inflammatory disease of the skin with unknown etiology. It is characterized by moderate ERYTHEMA, dry, moist, or greasy (SEBACEOUS GLAND) scaling and yellow crusted patches on various areas, especially the scalp, that exfoliate as dandruff. Seborrheic dermatitis is common in children and adolescents with HIV INFECTIONS.
Pityriasis
A name originally applied to a group of skin diseases characterized by the formation of fine, branny scales, but now used only with a modifier. (Dorland, 27th ed)
About the L21 Code Range
Seborrheic dermatitis is long-lasting skin inflammation with an unknown cause. It can cause redness, dry, moist, or greasy scales, and yellow crusted patches, especially on the scalp. Scalp flakes may appear as dandruff.
L21.0 identifies seborrhea of the scalp, while L21.1 identifies seborrheic dermatitis in infants. L21.8 identifies other seborrheic dermatitis, and L21.9 identifies seborrheic dermatitis that is unspecified.
Questions About This Page
How many billable codes are in the L21 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the L21 range classify?
The range classifies seborrheic dermatitis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
