Allergic contact dermatitis (L23) ICD-10-CM
The L23 code range covers allergic contact dermatitis with 13 ICD-10-CM diagnosis codes. 11 of them are billable and valid for claim submission in fiscal year 2027, 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.
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 L23 Range 13 codes · 11 billable
- L23 Allergic contact dermatitisNon-billable
- L23.0 Allergic contact dermatitis due to metals
- L23.1 Allergic contact dermatitis due to adhesives
- L23.2 Allergic contact dermatitis due to cosmetics
- L23.3 Allergic contact dermatitis due to drugs in contact with skin
- L23.4 Allergic contact dermatitis due to dyes
- L23.5 Allergic contact dermatitis due to other chemical products
- L23.6 Allergic contact dermatitis due to food in contact with the skin
- L23.7 Allergic contact dermatitis due to plants, except food
- L23.8 Allergic contact dermatitis due to other agentsNon-billable
- L23.81 Allergic contact dermatitis due to animal (cat) (dog) dander
- L23.89 Allergic contact dermatitis due to other agents
- L23.9 Allergic contact dermatitis, unspecified cause
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the L23 range.
Dermatitis, Allergic Contact
A contact dermatitis due to allergic sensitization to various substances. These substances subsequently produce inflammatory reactions in the skin of those who have acquired hypersensitivity to them as a result of prior exposure.
About the L23 Code Range
Allergic contact dermatitis is skin inflammation that occurs when a substance touches skin after a person has become sensitive to it through earlier exposure.
The subdivisions separate causes: metals, adhesives, cosmetics, drugs touching skin, dyes, other chemical products, food touching skin, and nonfood plants. L23.8 groups other agents. Within it, L23.81 specifies animal dander, including cat or dog dander, while L23.89 identifies other agents. L23.9 leaves the cause unspecified.
Questions About This Page
How many billable codes are in the L23 range?
Of the 13 codes in this range, 11 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the L23 range classify?
The range classifies allergic contact dermatitis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
