2027 ICD-10-CM Diagnosis Code L20.84Intrinsic (allergic) eczema
ICD-10-CM Codes›L00–L99›L20-L30›L20
- Billable — Valid for Submission
- Chronic Condition
L20.84 is a billable ICD-10-CM diagnosis code for intrinsic (allergic) eczema. 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L20.84: its own notes plus those printed at L20.8, 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.
Eczema (acute) (chronic) (erythematous) (fissum) (rubrum) (squamous) See Also: Dermatitis; L30.9
intrinsic (allergic) L20.84
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 L20.84 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L20.84Overview
What is the ICD-10 code for intrinsic (allergic) eczema?
The ICD-10-CM code for intrinsic (allergic) eczema is L20.84 (sometimes written as L2084). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is L20.84 (Other atopic dermatitis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report intrinsic (allergic) eczema on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L20.84 group to?
When intrinsic (allergic) eczema 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 L20.84?
Under the General Equivalence Mappings, intrinsic (allergic) eczema converts to ICD-9-CM 691.8 (other atopic dermatitis). The mapping is approximate, so confirm the match fits the documentation.
