2027 ICD-10-CM Diagnosis Code L20.9Atopic dermatitis, unspecified
ICD-10-CM Codes›L00–L99›L20-L30›L20
- Billable — Valid for Submission
- Chronic Condition
L20.9 is a billable ICD-10-CM diagnosis code for atopic dermatitis, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Allergic reactions and Other specified inflammatory condition of skin.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adult atopic dermatitis
- Adult atopic dermatitis commencing in adult life
- Adult generalized atopic dermatitis
- Atopic dermatitis
- Atopic dermatitis of bilateral hands
- Atopic dermatitis of eyelid
- Atopic dermatitis of face
- Atopic dermatitis of scalp
- Cheilitis due to atopic dermatitis
- Childhood atopic dermatitis
- Childhood impetiginized atopic dermatitis
- Eczema of scalp
- Exacerbation of constitutional dermatitis due to exposure to contact allergen
- Facial eczema
- Generalized atopic dermatitis
- Impetiginized atopic dermatitis
- Infected eczema
- Infectious eczematoid dermatitis
- Pustular eczema
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L20.9: its own notes plus those printed at block L20-L30 and Chapter 12. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may 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.-)
Notes
General instructions on how these codes are used.
- In this block the terms dermatitis and eczema are used synonymously and interchangeably.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Dermatitis, Atopic
a chronic inflammatory genetically determined disease of the skin marked by increased ability to form reagin (ige), with increased susceptibility to allergic rhinitis and asthma, and hereditary disposition to a lowered threshold for pruritus. it is manifested by lichenification, excoriation, and crusting, mainly on the flexural surfaces of the elbow and knee. in infants it is known as infantile eczema.
Patient EducationClinical
Eczema
Eczema is a term for several different types of skin swelling. Eczema is also called dermatitis. Most types cause dry, itchy skin and rashes on the face, inside the elbows and behind the knees, and on the hands and feet. Scratching the skin can cause it to turn red, and to swell and itch even more.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert L20.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L20.9Overview
What is the ICD-10 code for atopic dermatitis, unspecified?
The ICD-10-CM code for atopic dermatitis, unspecified is L20.9 (sometimes written as L209). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is L20.9 (Atopic dermatitis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report atopic dermatitis, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L20.9 group to?
When atopic dermatitis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 607, 606, with relative weights from 0.8772 to 1.5721 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of L20.9?
Under the General Equivalence Mappings, atopic dermatitis, unspecified converts to ICD-9-CM 691.8 (other atopic dermatitis). The mapping is approximate, so confirm the match fits the documentation.
