Dermatitis due to substances taken internally (L27) ICD-10-CM
The L27 code range covers dermatitis due to substances taken internally with 6 ICD-10-CM diagnosis codes. 5 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- allergy NOS T78.40
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the L27 Range 6 codes · 5 billable
- L27 Dermatitis due to substances taken internallyNon-billable
- L27.0 Generalized skin eruption due to drugs and medicaments taken internally
- L27.1 Localized skin eruption due to drugs and medicaments taken internally
- L27.2 Dermatitis due to ingested food
- L27.8 Dermatitis due to other substances taken internally
- L27.9 Dermatitis due to unspecified substance taken internally
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the L27 range.
Intertrigo
A superficial dermatitis occurring on skin surfaces in contact with each other, such as the axillae, neck creases, intergluteal fold, between the toes, etc. Obesity is a predisposing factor. The condition is caused by moisture and friction and is characterized by erythema, maceration, burning, and exudation.
About the L27 Code Range
ICD-10 code L27 covers various types of dermatitis caused by substances taken internally, including drugs, food, or other ingested chemicals. These codes help specify the skin reaction’s cause and extent, aiding accurate diagnosis and treatment.
The section includes L27.0 for generalized skin eruptions from drugs and medicaments taken internally, also known as drug exanthem or maculopapular drug eruption. This helps identify widespread allergic reactions to medications like ampicillin or fluoroquinolones. L27.1 describes localized skin eruptions such as fixed drug reactions or acneiform eruptions from specific drugs. When the dermatitis results specifically from ingested food, L27.2 applies. L27.8 captures dermatitis caused by other internal substances, including halogen eruptions and bromoderma. When the exact internal cause is unknown, L27.9 is used to code unspecified dermatitis due to internal substances, sometimes referred to as baboon syndrome or intertrigo. These detailed codes guide medical coders in selecting the right ICD-10 code for skin conditions caused by internal agents, improving clarity in patient records and billing.
Questions About This Page
How many billable codes are in the L27 range?
Of the 6 codes in this range, 5 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the L27 range classify?
The range classifies dermatitis due to substances taken internally. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
