L24.B1 vs T78.40
L24.B1 (Irritant contact dermatitis related to digestive stoma or fistula) compared with T78.40 (Allergy, unspecified), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. L24.B1 carries an Excludes1 note covering T78.40: “allergy NOS (T78.40)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| L24.B1Irritant contact dermatitis related to digestive stoma or fistula | T78.40Allergy, unspecified | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Irritant contact dermatitis related to digestive stoma or fistula is a billable ICD-10-CM diagnosis code (L24.B1). | Allergy, unspecified is a non-billable ICD-10-CM category code (T78.40). |
| 7th character | — | The appropriate 7th character is to be added to each code from category T78 |
| Includes | Irritant contact dermatitis related to gastrostomy Irritant contact dermatitis related to jejunostomy Irritant contact dermatitis related to saliva or spit fistula | Allergic reaction NOS Hypersensitivity NOS |
| Use additional code | code to identify any artificial opening status (Z93.-), if applicable, for contact dermatitis related to stoma secretions | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources