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L21.9

L21.9: Seborrheic dermatitis, unspecified

Billable / specific codeICD-10-CM

L21.9 is a billable, specific ICD-10-CM code for seborrheic dermatitis, unspecified. It is valid for submission on a claim.

Check L21.9 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Seborrhea NOS

Excludes2 inherited from the categories above L21.9

Not part of this code, but both may be coded when both are present.

Written on L21: Seborrheic dermatitis

  • infective dermatitis (L30.3)
  • seborrheic keratosis (L82.-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

  • Seborrhea, seborrheic
  • Dermatitis›seborrheic
  • Seborrhea, seborrheic›dermatitis
  • Seborrhea, seborrheic›eczema

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under L21

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.