2027 ICD-10-CM Diagnosis Code L27Dermatitis due to substances taken internally

ICD-10-CM Codes›L00–L99›L20-L30›L27

ICD-10-CM L27
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

L27 is a non-billable ICD-10-CM category code for dermatitis due to substances taken internally, so it cannot be submitted on claims. Use a more specific code from this category instead, such as L27.0, L27.1, L27.2, and L27.8.

Code Identity

ICD-10-CM Code
L27
Billable Status
No — Non-Billable Category
Code Describes
Dermatitis due to substances taken internally
Short Description
Dermatitis due to substances taken internally
Same as the full description in the CMS dataset.
Chapter
L20-L30
Dermatitis and eczema

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL20-L30Dermatitis and eczema
CategoryL27Dermatitis due to substances taken internally
This CodeL27Dermatitis due to substances taken internally

Specific Coding for Dermatitis due to substances taken internallyOverview

Non-specific codes like L27 require more characters. Use one of these billable codes instead:

  • Use L27.0 for Generalized skin eruption due to drugs and medicaments taken internally

  • Use L27.1 for Localized skin eruption due to drugs and medicaments taken internally

  • Use L27.2 for Dermatitis due to ingested food

  • Use L27.8 for Dermatitis due to other substances taken internally

  • Use L27.9 for Dermatitis due to unspecified substance taken internally

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to L27: 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.

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.

On L27 itself
  • 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.-)
From Block L20-L30 Dermatitis and eczema applies to 74 codes
  • 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)
From Chapter 12 (L00-L99) Diseases of the skin and subcutaneous tissue applies to 1,001 codes
  • 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.

From Block L20-L30 Dermatitis and eczema applies to 74 codes
  • 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 L27, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming L27: they are not reported together with it, unless the two conditions are unrelated.

  • T78.4 Other and unspecified allergy
    dermatitis (L23-L25, L27.-)

Excludes2 3

These codes carry an Excludes2 note naming L27: its condition is not part of those codes, and both may be reported when the patient has both.

  • L23 Allergic contact dermatitis
    dermatitis due to substances taken internally (L27.-)
  • L24 Irritant contact dermatitis
    dermatitis due to substances taken internally (L27.-)
  • L25 Unspecified contact dermatitis
    dermatitis due to ingested substances (L27.-)

Code First 1

These codes say to code first a condition named in the note, and L27 is one of the conditions named.

  • Block T36-T50 Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances
    dermatitis due to substances taken internally (L27.-)

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.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About L27Overview

What is the ICD-10 code for dermatitis due to substances taken internally?

L27 is the ICD-10-CM category for dermatitis due to substances taken internally, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is L27 (Dermatitis due to substances taken internally) a billable code?

No. This is a category header that groups the codes for dermatitis due to substances taken internally, and headers cannot be submitted on claims. Claims for dermatitis due to substances taken internally need a more specific code from this category, such as L27.0, L27.1, and L27.2.

Can L27 be reported with T78.40?

Not as a rule. The Excludes1 note on L27 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).