L27 – Dermatitis due to substances taken internally

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

Non-billable header

ICD-10-CM code L27

Code: L27 (claims format: L27)
Description: Dermatitis due to substances taken internally
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 L27

L27 is a header code and cannot be used on claims. Choose the most specific code:

Notes for L27

Excludes1 (not coded here):

allergy NOS (T78.40)

Excludes2 (not included here):

adverse food reaction, except dermatitis (T78.0-T78.1)
contact dermatitis (L23-L25)
drug photoallergic response (L56.1)
drug phototoxic response (L56.0)
urticaria (L50.-)

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 L27?

L27 is the ICD-10-CM code for dermatitis due to substances taken internally, in the block L20-L30 (Dermatitis and eczema).

Is L27 a billable code?

No. L27 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.