2027 ICD-10-CM Diagnosis Code L24.9Irritant contact dermatitis, unspecified cause
ICD-10-CM Codes›L00–L99›L20-L30›L24
- Billable — Valid for Submission
- Not Chronic
L24.9 is a billable ICD-10-CM diagnosis code for irritant contact dermatitis, unspecified cause. 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 Contact dermatitis.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute contact dermatitis
- Acute irritant contact dermatitis
- Acute irritant contact dermatitis of hand
- Chronic contact dermatitis
- Chronic irritant contact dermatitis
- Chronic irritant contact dermatitis of hands
- Complication of colostomy
- Contact dermatitis of external ear
- Contact dermatitis of female genitalia
- Contact dermatitis of foot
- Contact dermatitis of lower leg
- Contact dermatitis of male genitalia
- Contact dermatitis of neck
- Contact dermatitis of perianal skin
- Contact dermatitis of scalp
- Contact dermatitis of skin of left hand
- Contact dermatitis of skin of right hand
- Exacerbation of constitutional dermatitis due to occupation
- Exacerbation of constitutional dermatitis due to occupational exposure to skin irritant
- Irritant contact dermatitis
- Irritant contact dermatitis due to colostomy
- Irritant contact dermatitis due to stoma
- Irritant contact dermatitis of external ear
- Irritant contact dermatitis of face
- Irritant contact dermatitis of female genitalia
- Irritant contact dermatitis of foot
- Irritant contact dermatitis of hand
- Irritant contact dermatitis of lower leg
- Irritant contact dermatitis of male genitalia
- Irritant contact dermatitis of neck
- Irritant contact dermatitis of scalp
- Occupational irritant contact dermatitis
- Perianal dermatitis
- Perianal irritant contact dermatitis
- Peristomal dermatitis
- Peristomal skin complication
- Subacute contact dermatitis
- Subacute dermatitis
- Subacute irritant contact dermatitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L24.9: its own notes plus those printed at L24, block L20-L30, and Chapter 12. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Irritant contact eczema NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name L24.9, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming L24.9: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 3
These codes carry an Excludes2 note naming L24.9: its condition is not part of those codes, and both may be reported when the patient has both.
Code First 2
These codes say to code first a condition named in the note, and L24.9 is one of the conditions named.
- F54 Psychological and behavioral factors associated with disorders or diseases classified elsewhere
- Block T36-T50 Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances
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
Irritant Contact Dermatitis
an inflammatory skin condition caused by direct contact between the skin and an irritating substance. it is typically manifested by erythema, mild edema, and scaling at the affected site.
Patient EducationClinical
Rashes
A rash is an area of irritated or swollen skin. Many rashes are itchy, red, painful, and irritated. Some rashes can also lead to blisters or patches of raw skin. Rashes are a symptom of many different medical problems. Other causes include irritating substances and allergies. Certain genes can make people more likely to get rashes.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert L24.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L24.9Overview
What is the ICD-10 code for irritant contact dermatitis, unspecified cause?
The ICD-10-CM code for irritant contact dermatitis, unspecified cause is L24.9 (sometimes written as L249). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is L24.9 (Irritant contact dermatitis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report irritant contact dermatitis, unspecified cause on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L24.9 group to?
When irritant contact dermatitis, unspecified cause 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.
Can L24.9 be reported with T78.40?
Not as a rule. The Excludes1 note at L24, which applies to L24.9, lists "allergy NOS (T78.40)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of L24.9?
Under the General Equivalence Mappings, irritant contact dermatitis, unspecified cause converts to ICD-9-CM 692.9 (dermatitis NOS). The mapping is approximate, so confirm the match fits the documentation.
