L21 ICD-10-CA category: Seborrhoeic dermatitis
L21 isn’t a code on its own. Choose one of the 4 codes beneath it, the one the documentation supports.
Official description
L21Seborrhoeic dermatitis
ICD-10-CA · Canada
Codes in L21
L21 isn’t a code on its own. Open the code that matches what the note documents.
Notes for L21
As CIHI prints them, with any note L21 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Infective dermatitis (L30.3)
- Chronic (childhood) granulomatous disease (D71)dermatitis:• dry skin (L85.3)• factitial (L98.1)• gangrenosa (L08.0)• herpetiformis (L13.0)• perioral (L71.0)• stasis (I83.1-I83.2)radiation-related disorders of the skin and subcutaneous tissue (L55-L59)From L20-L30 Dermatitis and eczema
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)lipomelanotic reticulosis (I89.8)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)systemic connective tissue disorders (M30-M36)From Chapter 12: Diseases of the skin and subcutaneous tissue (L00-L99)
Note
- In this block the terms dermatitis and eczema are used synonymously and interchangeably.From L20-L30 Dermatitis and eczema
Where L21 sits
- 1ChapterChapter 12: Diseases of the skin and subcutaneous tissue (L00-L99)
- 2Block L20-L30Dermatitis and eczema
- 3Category L21Seborrhoeic dermatitis
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is L21 a valid ICD-10-CA code?
No. L21 (Seborrhoeic dermatitis) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 4 codes; record the one the documentation supports.
Where is L21 in ICD-10-CA?
L21 sits under L20-L30 Dermatitis and eczema, within Chapter 12: Diseases of the skin and subcutaneous tissue (L00-L99).
What coding notes apply to L21?
ICD-10-CA lists Excludes, Note notes for L21, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.