L23 – Allergic contact dermatitis

ICD-10-CM 2027 diagnosis code · Dermatitis and eczema

Non-billable header

ICD-10-CM code L23

Code: L23 (claims format: L23)
Description: Allergic contact dermatitis
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 12. Diseases of the skin and subcutaneous tissue (L00-L99)
Block: L20-L30 Dermatitis and eczema

Billable codes under L23

L23 is a header code and cannot be used on claims. Choose the most specific code:

L23.0 – Allergic contact dermatitis due to metalsBillable
L23.1 – Allergic contact dermatitis due to adhesivesBillable
L23.2 – Allergic contact dermatitis due to cosmeticsBillable
L23.3 – Allergic contact dermatitis due to drugs in contact with skinBillable
L23.4 – Allergic contact dermatitis due to dyesBillable
L23.5 – Allergic contact dermatitis due to other chemical productsBillable
L23.6 – Allergic contact dermatitis due to food in contact with the skinBillable
L23.7 – Allergic contact dermatitis due to plants, except foodBillable
L23.8 – Allergic contact dermatitis due to other agentsHeader (more codes below)
L23.9 – Allergic contact dermatitis, unspecified causeBillable

Notes for L23

Excludes1 (not coded here):

allergy NOS (T78.40)
contact dermatitis NOS (L25.9)
dermatitis NOS (L30.9)

Excludes2 (not included here):

dermatitis due to substances taken internally (L27.-)
dermatitis of eyelid (H01.1-)
diaper dermatitis (L22)
eczema of external ear (H60.5-)
irritant contact dermatitis (L24.-)
perioral dermatitis (L71.0)
radiation-related disorders of the skin and subcutaneous tissue (L55-L59)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block L20-L30

Excludes2 (not included here):

chronic (childhood) granulomatous disease (D71-)
dermatitis gangrenosa (L08.0)
dermatitis herpetiformis (L13.0)
dry skin dermatitis (L85.3)
factitial dermatitis (L98.1)
perioral dermatitis (L71.0)
radiation-related disorders of the skin and subcutaneous tissue (L55-L59)
stasis dermatitis (I87.2)

Notes:

In this block the terms dermatitis and eczema are used synonymously and interchangeably.

Frequently asked questions

What is ICD-10 code L23?

L23 is the ICD-10-CM code for allergic contact dermatitis, in the block L20-L30 (Dermatitis and eczema).

Is L23 a billable code?

No. L23 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.