L27 vs T78.1
L27 (Dermatitis due to substances taken internally) compared with T78.1 (Other adverse food reactions, not elsewhere classified), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. L27 carries an Excludes2 note covering T78.1: “adverse food reaction, except dermatitis (T78.0-T78.1)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| L27Dermatitis due to substances taken internally | T78.1Other adverse food reactions, not elsewhere classified | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header Report instead: T78.110A, T78.110D, T78.110S, T78.111A, T78.111D |
| 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 | Dermatitis due to substances taken internally is a non-billable ICD-10-CM category code (L27). | Other adverse food reactions, not elsewhere classified is a non-billable ICD-10-CM category code (T78.1). |
| 7th character | — | The appropriate 7th character is to be added to each code from category T78 |
| Use additional code | — | code to identify the type of reaction, if applicable |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources